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100个直接可以拿来用的JavaScript实用功能代码片段

目录如下:

1、原生JavaScript实现字符串长度截取
2、原生JavaScript获取域名主机
3、原生JavaScript清除空格
4、原生JavaScript替换全部
5、原生JavaScript转义html标签
6、原生JavaScript还原html标签
7、原生JavaScript时间日期格式转换
8、原生JavaScript判断是否为数字类型
9、原生JavaScript设置cookie值
10、原生JavaScript获取cookie值
11、原生JavaScript加入收藏夹
12、原生JavaScript设为首页
13、原生JavaScript判断IE6
14、原生JavaScript加载样式文件
15、原生JavaScript返回脚本内容
16、原生JavaScript清除脚本内容
17、原生JavaScript动态加载脚本文件
18、原生JavaScript返回按ID检索的元素对象
19、原生JavaScript返回浏览器版本内容
20、原生JavaScript元素显示的通用方法
21、原生JavaScript中有insertBefore方法,可惜却没有insertAfter方法?用如下函数实现
22、原生JavaScript中兼容浏览器绑定元素事件
23、原生JavaScript光标停在文字的后面,文本框获得焦点时调用
24、原生JavaScript检验URL链接是否有效
25、原生JavaScript格式化CSS样式代码
26、原生JavaScript压缩CSS样式代码
27、原生JavaScript获取当前路径
28、原生JavaScriptIP转成整型
29、原生JavaScript整型解析为IP地址
30、原生JavaScript实现checkbox全选与全不选
31、原生JavaScript判断是否移动设备
32、原生JavaScript判断是否移动设备访问
33、原生JavaScript判断是否苹果移动设备访问
34、原生JavaScript判断是否安卓移动设备访问
35、原生JavaScript判断是否Touch屏幕
36、原生JavaScript判断是否在安卓上的谷歌浏览器
37、原生JavaScript判断是否打开视窗
38、原生JavaScript获取移动设备初始化大小
39、原生JavaScript获取移动设备最大化大小
40、原生JavaScript获取移动设备屏幕宽度
41、原生JavaScript完美判断是否为网址
42、原生JavaScript根据样式名称检索元素对象
43、原生JavaScript判断是否以某个字符串开头
44、原生JavaScript判断是否以某个字符串结束
45、原生JavaScript返回IE浏览器的版本号
46、原生JavaScript获取页面高度
47、原生JavaScript获取页面scrollLeft
48、原生JavaScript获取页面可视宽度
49、原生JavaScript获取页面宽度
50、原生JavaScript获取页面scrollTop
51、原生JavaScript获取页面可视高度
52、原生JavaScript跨浏览器添加事件
53、原生JavaScript跨浏览器删除事件
54、原生JavaScript去掉url前缀
55、原生JavaScript随机数时间戳
56、原生JavaScript全角半角转换,iCase: 0全到半,1半到全,其他不转化
57、原生JavaScript确认是否键盘有效输入值
58、原生JavaScript获取网页被卷去的位置
59、原生JavaScript另一种正则日期格式化函数+调用方法
60、原生JavaScript时间个性化输出功能
61、原生JavaScript解决offsetX兼容性问题
62、原生JavaScript常用的正则表达式
63、原生JavaScript实现返回顶部的通用方法
64、原生JavaScript获得URL中GET参数值
65、原生JavaScript实现全选通用方法
66、原生JavaScript实现全部取消选择通用方法
67、原生JavaScript实现打开一个窗体通用方法
68、原生JavaScript判断是否为客户端设备
69、原生JavaScript获取单选按钮的值
70、原生JavaScript获取复选框的值
71、原生JavaScript判断是否为邮箱
72、原生JavaScript判断是否有列表中的危险字符
73、原生JavaScript判断字符串是否大于规定的长度
74、原生JavaScript判断字符串是为网址不区分大小写
75、原生JavaScript判断字符串是否为小数
76、原生JavaScript判断字符串是否为整数
77、原生JavaScript判断字符串是否为浮点数
78、原生JavaScript判断字符是否为A-Za-z英文字母
79、原生JavaScript判断字符串是否邮政编码
80、原生JavaScript判断字符是否空NULL
81、原生JavaScript用正则表达式提取页面代码中所有网址
82、原生JavaScript用正则表达式清除相同的数组(低效率)
83、原生JavaScript用正则表达式清除相同的数组(高效率)
84、原生JavaScript用正则表达式按字母排序,对每行进行数组排序
85、原生JavaScript字符串反序
86、原生JavaScript用正则表达式清除html代码中的脚本
87、原生JavaScript动态执行JavaScript脚本
88、原生JavaScript动态执行VBScript脚本
89、原生JavaScript实现金额大写转换函数
90、原生JavaScript常用的正则表达式大收集
91、原生JavaScript实现窗体改变事件resize的操作(兼容所以的浏览器)
92、原生JavaScript用正则清除空格分左右
93、原生JavaScript判断变量是否空值
94、原生JavaScript实现base64解码
95、原生JavaScript实现utf8解码
96、原生JavaScript获取窗体可见范围的宽与高
97、原生JavaScript判断IE版本号(既简洁、又向后兼容!)
98、原生JavaScript获取浏览器版本号
99、原生JavaScript半角转换为全角函数
100、原生JavaScript全角转换为半角函数

1、原生JavaScript实现字符串长度截取

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function cutstr(str, len) {
     var temp;
     var icount = 0;
     var patrn = /[^x00-xff]/;
     var strre = "";
     for (var i = 0; i < str.length; i++) {
         if (icount < len - 1) {
             temp = str.substr(i, 1);
             if (patrn.exec(temp) == null) {
                 icount = icount + 1
             } else {
                 icount = icount + 2
             }
             strre += temp
         } else {
             break
         }
     }
     return strre + "..."
 }

2、原生JavaScript获取域名主机

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    function getHost(url) {
        var host = "null";
        if(typeof url == "undefined"|| null == url) {
            url = window.location.href;
        }
        var regex = /^w+://([^/]*).*/;
        var match = url.match(regex);
        if(typeof match != "undefined" && null != match) {
            host = match[1];
        }
        return host;
}

3、原生JavaScript清除空格

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String.prototype.trim = function() {
      var reExtraSpace = /^s*(.*?)s+$/;
      return this.replace(reExtraSpace, "$1")
  }

4、原生JavaScript替换全部

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String.prototype.replaceAll = function(s1, s2) {
    return this.replace(new RegExp(s1, "gm"), s2)
}

5、原生JavaScript转义html标签

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function HtmlEncode(text) {
        return text.replace(/&/g, '&amp').replace(/"/g, '&quot;').replace(/</g, '&lt;').replace(/>/g, '&gt;')
    }

6、原生JavaScript还原html标签

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function HtmlDecode(text) {
        return text.replace(/&amp;/g, '&').replace(/&quot;/g, '"').replace(/&lt;/g, '<').replace(/&gt;/g, '>')
    }

7、原生JavaScript时间日期格式转换

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Date.prototype.Format = function(formatStr) {
    var str = formatStr;
    var Week = ['日', '一', '二', '三', '四', '五', '六'];
    str = str.replace(/yyyy|YYYY/, this.getFullYear());
    str = str.replace(/yy|YY/, (this.getYear() % 100) > 9 ? (this.getYear() % 100).toString() : '0' + (this.getYear() % 100));
    str = str.replace(/MM/, (this.getMonth() + 1) > 9 ? (this.getMonth() + 1).toString() : '0' + (this.getMonth() + 1));
    str = str.replace(/M/g, (this.getMonth() + 1));
    str = str.replace(/w|W/g, Week[this.getDay()]);
    str = str.replace(/dd|DD/, this.getDate() > 9 ? this.getDate().toString() : '0' + this.getDate());
    str = str.replace(/d|D/g, this.getDate());
    str = str.replace(/hh|HH/, this.getHours() > 9 ? this.getHours().toString() : '0' + this.getHours());
    str = str.replace(/h|H/g, this.getHours());
    str = str.replace(/mm/, this.getMinutes() > 9 ? this.getMinutes().toString() : '0' + this.getMinutes());
    str = str.replace(/m/g, this.getMinutes());
    str = str.replace(/ss|SS/, this.getSeconds() > 9 ? this.getSeconds().toString() : '0' + this.getSeconds());
    str = str.replace(/s|S/g, this.getSeconds());
    return str
}

8、原生JavaScript判断是否为数字类型

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function isDigit(value) {
        var patrn = /^[0-9]*$/;
        if (patrn.exec(value) == null || value == "") {
            return false
        } else {
            return true
        }
    }

9、原生JavaScript设置cookie值

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function setCookie(name, value, Hours) {
            var d = new Date();
        var offset = 8;
        var utc = d.getTime() + (d.getTimezoneOffset() * 60000);
        var nd = utc + (3600000 * offset);
        var exp = new Date(nd);
        exp.setTime(exp.getTime() + Hours * 60 * 60 * 1000);
        document.cookie = name + "=" + escape(value) + ";path=/;expires=" + exp.toGMTString() + ";domain=360doc.com;"
    }

10、原生JavaScript获取cookie值

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function getCookie(name) {
    var arr = document.cookie.match(new RegExp("(^| )" + name + "=([^;]*)(;|$)"));
    if (arr != null) return unescape(arr[2]);
    return null
}

11、原生JavaScript加入收藏夹

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function AddFavorite(sURL, sTitle) {
        try {
            window.external.addFavorite(sURL, sTitle)
        } catch(e) {
            try {
                window.sidebar.addPanel(sTitle, sURL, "")
            } catch(e) {
                alert("加入收藏失败,请使用Ctrl+D进行添加")
            }
        }
    }

12、原生JavaScript设为首页

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function setHomepage() {
        if (document.all) {
            document.body.style.behavior = 'url(#default#homepage)';
            document.body.setHomePage('http://www.jq-school.com')
        } else if (window.sidebar) {
            if (window.netscape) {
                try {
                    netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect")
                } catch(e) {
                    alert("该操作被浏览器拒绝,如果想启用该功能,请在地址栏内输入 about:config,然后将项 signed.applets.codebase_principal_support 值该为true")
                }
            }
            var prefs = Components.classes['@mozilla.org/preferences-service;1'].getService(Components.interfaces.nsIPrefBranch);
            prefs.setCharPref('browser.startup.homepage', 'http://www.jq-school.com')
        }
    }

13、原生JavaScript判断IE6

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var ua = navigator.userAgent.toLowerCase();
    var isIE6 = ua.indexOf("msie 6") > -1;
    if (isIE6) {
        try {
            document.execCommand("BackgroundImageCache", false, true)
        } catch(e) {}
    }

14、原生JavaScript加载样式文件

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function LoadStyle(url) {
        try {
            document.createStyleSheet(url)
        } catch(e) {
            var cssLink = document.createElement('link');
            cssLink.rel = 'stylesheet';
            cssLink.type = 'text/css';
            cssLink.href = url;
            var head = document.getElementsByTagName('head')[0];
            head.appendChild(cssLink)
        }
    }

15、原生JavaScript返回脚本内容

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function evalscript(s) {
        if(s.indexOf('<script') == -1) return s;
        var p = /<script[^>]*?>([^x00]*?)</script>/ig;
        var arr = [];
        while(arr = p.exec(s)) {
            var p1 = /<script[^>]*?src="([^>]*?)"[^>]*?(reload="1")?(?:charset="([w-]+?)")?></script>/i;
            var arr1 = [];
            arr1 = p1.exec(arr[0]);
            if(arr1) {
                appendscript(arr1[1], '', arr1[2], arr1[3]);
            } else {
                p1 = /<script(.*?)>([^x00]+?)</script>/i;
                arr1 = p1.exec(arr[0]);
                appendscript('', arr1[2], arr1[1].indexOf('reload=') != -1);
            }
        }
        return s;
    }

16、原生JavaScript清除脚本内容

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function stripscript(s) {
        return s.replace(/<script.*?>.*?</script>/ig, '');
    }

17、原生JavaScript动态加载脚本文件

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function appendscript(src, text, reload, charset) {
        var id = hash(src + text);
        if(!reload && in_array(id, evalscripts)) return;
        if(reload && $(id)) {
            $(id).parentNode.removeChild($(id));
        }
        evalscripts.push(id);
        var scriptNode = document.createElement("script");
        scriptNode.type = "text/javascript";
        scriptNode.id = id;
        scriptNode.charset = charset ? charset : (BROWSER.firefox ? document.characterSet : document.charset);
        try {
            if(src) {
                scriptNode.src = src;
                scriptNode.onloadDone = false;
                scriptNode.onload = function () {
                    scriptNode.onloadDone = true;
                    JSLOADED[src] = 1;
                };
                scriptNode.onreadystatechange = function () {
                    if((scriptNode.readyState == 'loaded' || scriptNode.readyState == 'complete') && !scriptNode.onloadDone) {
                        scriptNode.onloadDone = true;
                        JSLOADED[src] = 1;
                    }
                };
            } else if(text){
                scriptNode.text = text;
            }
            document.getElementsByTagName('head')[0].appendChild(scriptNode);
        } catch(e) {}
    }

18、原生JavaScript返回按ID检索的元素对象

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function $(id) {
        return !id ? null : document.getElementById(id);
    }

19、原生JavaScript返回浏览器版本内容

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function browserVersion(types) {
        var other = 1;
        for(i in types) {
            var v = types[i] ? types[i] : i;
            if(USERAGENT.indexOf(v) != -1) {
                var re = new RegExp(v + '(/|s)([d.]+)', 'ig');
                var matches = re.exec(USERAGENT);
                var ver = matches != null ? matches[2] : 0;
                other = ver !== 0 && v != 'mozilla' ? 0 : other;
            }else {
                var ver = 0;
            }
            eval('BROWSER.' + i + '= ver');
        }
        BROWSER.other = other;
    }

20、原生JavaScript元素显示的通用方法

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function $(id) {
        return !id ? null : document.getElementById(id);
    }
    function display(id) {
        var obj = $(id);
        if(obj.style.visibility) {
            obj.style.visibility = obj.style.visibility == 'visible' ? 'hidden' : 'visible';
        } else {
            obj.style.display = obj.style.display == '' ? 'none' : '';
        }
    }

21、原生JavaScript中有insertBefore方法,可惜却没有insertAfter方法?用如下函数实现

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function insertAfter(newChild,refChild){
    var parElem=refChild.parentNode;
    if(parElem.lastChild==refChild){
        refChild.appendChild(newChild);
    }else{
        parElem.insertBefore(newChild,refChild.nextSibling);
    }
}

22、原生JavaScript中兼容浏览器绑定元素事件

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function addEventSamp(obj,evt,fn){
    if (obj.addEventListener) {
        obj.addEventListener(evt, fn, false);
    }else if(obj.attachEvent){
        obj.attachEvent('on'+evt,fn);
    }
}

23、原生JavaScript光标停在文字的后面,文本框获得焦点时调用

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function focusLast(){
    var e = event.srcElement;
    var r =e.createTextRange();
    r.moveStart('character',e.value.length);
    r.collapse(true);
    r.select();
}

24、原生JavaScript检验URL链接是否有效

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function getUrlState(URL){
    var xmlhttp = new ActiveXObject("microsoft.xmlhttp");
    xmlhttp.Open("GET",URL, false); 
    try
        xmlhttp.Send();
    }catch(e){
    }finally{
        var result = xmlhttp.responseText;
        if(result){
            if(xmlhttp.Status==200){
                return(true);
            }else{
                return(false);
            }
        }else{
            return(false);
        }
    }
}

25、原生JavaScript格式化CSS样式代码

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function formatCss(s){//格式化代码
    s = s.replace(/s*([{}:;,])s*/g, "$1");
    s = s.replace(/;s*;/g, ";"); //清除连续分号
    s = s.replace(/,[s.#d]*{/g, "{");
    s = s.replace(/([^s]){([^s])/g, "$1 {nt$2");
    s = s.replace(/([^s])}([^n]*)/g, "$1n}n$2");
    s = s.replace(/([^s]);([^s}])/g, "$1;nt$2");
    return s;
}

26、原生JavaScript压缩CSS样式代码

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function yasuoCss (s) {//压缩代码
    s = s.replace(//*(.|n)*?*//g, ""); //删除注释
    s = s.replace(/s*([{}:;,])s*/g, "$1");
    s = s.replace(/,[s.#d]*{/g, "{"); //容错处理
    s = s.replace(/;s*;/g, ";"); //清除连续分号
    s = s.match(/^s*(S+(s+S+)*)s*$/); //去掉首尾空白
    return (s == null) ? "" : s[1];
}

27、原生JavaScript获取当前路径

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var currentPageUrl = "";
if (typeof this.href === "undefined") {
    currentPageUrl = document.location.toString().toLowerCase();
}
else {
    currentPageUrl = this.href.toString().toLowerCase();
}

28、原生JavaScriptIP转成整型

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function _ip2int(ip){
    var num = 0;
    ip = ip.split(".");
    num = Number(ip[0]) * 256 * 256 * 256 + Number(ip[1]) * 256 * 256 + Number(ip[2]) * 256 + Number(ip[3]);
    num = num >>> 0;
    return num;
}

29、原生JavaScript整型解析为IP地址

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function _int2iP(num){
    var str;
    var tt = new Array();
    tt[0] = (num >>> 24) >>> 0;
    tt[1] = ((num << 8) >>> 24) >>> 0;
    tt[2] = (num << 16) >>> 24;
    tt[3] = (num << 24) >>> 24;
    str = String(tt[0]) + "." + String(tt[1]) + "." + String(tt[2]) + "." + String(tt[3]);
    return str;
}

30、原生JavaScript实现checkbox全选与全不选

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function checkAll() {
    var selectall = document.getElementById("selectall");
    var allbox = document.getElementsByName("allbox");
    if (selectall.checked) {
        for (var i = 0; i < allbox.length; i++) {
            allbox[i].checked = true;
        }
    } else {
        for (var i = 0; i < allbox.length; i++) {
            allbox[i].checked = false;
        }
    }
}

31、原生JavaScript判断是否移动设备

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function isMobile(){
    if (typeof this._isMobile === 'boolean'){
        return this._isMobile;
    }
    var screenWidth = this.getScreenWidth();
    var fixViewPortsExperiment = rendererModel.runningExperiments.FixViewport || rendererModel.runningExperiments.fixviewport;
    var fixViewPortsExperimentRunning = fixViewPortsExperiment && (fixViewPortsExperiment.toLowerCase() === "new");
    if(!fixViewPortsExperiment){
        if(!this.isAppleMobileDevice()){
            screenWidth = screenWidth/window.devicePixelRatio;
        }
    }
    var isMobileScreenSize = screenWidth < 600;
    var isMobileUserAgent = false;
    this._isMobile = isMobileScreenSize && this.isTouchScreen();
    return this._isMobile;
}

32、原生JavaScript判断是否移动设备访问

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function isMobileUserAgent(){
    return (/iphone|ipod|android.*mobile|windows.*phone|blackberry.*mobile/i.test(window.navigator.userAgent.toLowerCase()));
}

33、原生JavaScript判断是否苹果移动设备访问

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function isAppleMobileDevice(){
    return (/iphone|ipod|ipad|Macintosh/i.test(navigator.userAgent.toLowerCase()));
}

34、原生JavaScript判断是否安卓移动设备访问

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function isAndroidMobileDevice(){
    return (/android/i.test(navigator.userAgent.toLowerCase()));
}

35、原生JavaScript判断是否Touch屏幕

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function isTouchScreen(){
    return (('ontouchstart' in window) || window.DocumentTouch && document instanceof DocumentTouch);
}

36、原生JavaScript判断是否在安卓上的谷歌浏览器

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function isNewChromeOnAndroid(){
    if(this.isAndroidMobileDevice()){
        var userAgent = navigator.userAgent.toLowerCase();
        if((/chrome/i.test(userAgent))){
            var parts = userAgent.split('chrome/');
            var fullVersionString = parts[1].split(" ")[0];
            var versionString = fullVersionString.split('.')[0];
            var version = parseInt(versionString);
            if(version >= 27){
                return true;
            }
        }
    }
    return false;
}

37、原生JavaScript判断是否打开视窗

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function isViewportOpen() {
    return !!document.getElementById('wixMobileViewport');
}

38、原生JavaScript获取移动设备初始化大小

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function getInitZoom(){
    if(!this._initZoom){
        var screenWidth = Math.min(screen.height, screen.width);
        if(this.isAndroidMobileDevice() && !this.isNewChromeOnAndroid()){
            screenWidth = screenWidth/window.devicePixelRatio;
        }
        this._initZoom = screenWidth /document.body.offsetWidth;
    }
    return this._initZoom;
}

39、原生JavaScript获取移动设备最大化大小

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function getZoom(){
    var screenWidth = (Math.abs(window.orientation) === 90) ? Math.max(screen.height, screen.width) : Math.min(screen.height, screen.width);
    if(this.isAndroidMobileDevice() && !this.isNewChromeOnAndroid()){
        screenWidth = screenWidth/window.devicePixelRatio;
    }
    var FixViewPortsExperiment = rendererModel.runningExperiments.FixViewport || rendererModel.runningExperiments.fixviewport;
    var FixViewPortsExperimentRunning = FixViewPortsExperiment && (FixViewPortsExperiment === "New" || FixViewPortsExperiment === "new");
    if(FixViewPortsExperimentRunning){
        return screenWidth / window.innerWidth;
    }else{
        return screenWidth / document.body.offsetWidth;
    }
}

40、原生JavaScript获取移动设备屏幕宽度

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function getScreenWidth(){
    var smallerSide = Math.min(screen.width, screen.height);
    var fixViewPortsExperiment = rendererModel.runningExperiments.FixViewport || rendererModel.runningExperiments.fixviewport;
    var fixViewPortsExperimentRunning = fixViewPortsExperiment && (fixViewPortsExperiment.toLowerCase() === "new");
    if(fixViewPortsExperiment){
        if(this.isAndroidMobileDevice() && !this.isNewChromeOnAndroid()){
            smallerSide = smallerSide/window.devicePixelRatio;
        }
    }
    return smallerSide;
}

41、原生JavaScript完美判断是否为网址

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function IsURL(strUrl) {
    var regular = /^b(((https?|ftp)://)?[-a-z0-9]+(.[-a-z0-9]+)*.(?:com|edu|gov|int|mil|net|org|biz|info|name|museum|asia|coop|aero|[a-z][a-z]|((25[0-5])|(2[0-4]d)|(1dd)|([1-9]d)|d))b(/[-a-z0-9_:@&?=+,.!/~%$]*)?)$/i
    if (regular.test(strUrl)) {
        return true;
    }
    else {
        return false;
    }
}

42、原生JavaScript根据样式名称检索元素对象

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function getElementsByClassName(name) {
    var tags = document.getElementsByTagName('*') || document.all;
    var els = [];
    for (var i = 0; i < tags.length; i++) {
        if (tags[i].className) {
            var cs = tags[i].className.split(' ');
            for (var j = 0; j < cs.length; j++) {
                if (name == cs[j]) {
                    els.push(tags[i]);
                    break
                }
            }
        }
    }
    return els
}

43、原生JavaScript判断是否以某个字符串开头

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String.prototype.startWith = function (s) {
    return this.indexOf(s) == 0
}

44、原生JavaScript判断是否以某个字符串结束

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String.prototype.endWith = function (s) {
    var d = this.length - s.length;
    return (d >= 0 && this.lastIndexOf(s) == d)
}

45、原生JavaScript返回IE浏览器的版本号

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function getIE(){
    if (window.ActiveXObject){
        var v = navigator.userAgent.match(/MSIE ([^;]+)/)[1];
        return parseFloat(v.substring(0, v.indexOf(".")))
    }
    return false
}

46、原生JavaScript获取页面高度

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function getPageHeight(){
    var g = document, a = g.body, f = g.documentElement, d = g.compatMode == "BackCompat"
            ? a
            : g.documentElement;
    return Math.max(f.scrollHeight, a.scrollHeight, d.clientHeight);
}

47、原生JavaScript获取页面scrollLeft

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function getPageScrollLeft(){
    var a = document;
    return a.documentElement.scrollLeft || a.body.scrollLeft;
}

48、原生JavaScript获取页面可视宽度

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function getPageViewWidth(){
    var d = document, a = d.compatMode == "BackCompat"
            ? d.body
            : d.documentElement;
    return a.clientWidth;
}

49、原生JavaScript获取页面宽度

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function getPageWidth(){
    var g = document, a = g.body, f = g.documentElement, d = g.compatMode == "BackCompat"
            ? a
            : g.documentElement;
    return Math.max(f.scrollWidth, a.scrollWidth, d.clientWidth);
}

50、原生JavaScript获取页面scrollTop

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function getPageScrollTop(){
    var a = document;
    return a.documentElement.scrollTop || a.body.scrollTop;
}

51、原生JavaScript获取页面可视高度

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function getPageViewHeight() {
    var d = document, a = d.compatMode == "BackCompat"
            ? d.body
            : d.documentElement;
    return a.clientHeight;
}

52、原生JavaScript跨浏览器添加事件

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function addEvt(oTarget,sEvtType,fnHandle){
    if(!oTarget){return;}
    if(oTarget.addEventListener){
        oTarget.addEventListener(sEvtType,fnHandle,false);
    }else if(oTarget.attachEvent){
        oTarget.attachEvent("on" + sEvtType,fnHandle);
    }else{
        oTarget["on" + sEvtType] = fnHandle;
    }
}

53、原生JavaScript跨浏览器删除事件

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function delEvt(oTarget,sEvtType,fnHandle){
    if(!oTarget){return;}
    if(oTarget.addEventListener){
        oTarget.addEventListener(sEvtType,fnHandle,false);
    }else if(oTarget.attachEvent){
        oTarget.attachEvent("on" + sEvtType,fnHandle);
    }else{
        oTarget["on" + sEvtType] = fnHandle;
    }
}

54、原生JavaScript去掉url前缀

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function removeUrlPrefix(a){
  a=a.replace(/:/g,":").replace(/./g,".").replace(///g,"/");
  while(trim(a).toLowerCase().indexOf("http://")==0){
    a=trim(a.replace(/http:///i,""));
  }
  return a;
}

55、原生JavaScript随机数时间戳

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function uniqueId(){
    var a=Math.random,b=parseInt;
    return Number(new Date()).toString()+b(10*a())+b(10*a())+b(10*a());
}

56、原生JavaScript全角半角转换,iCase: 0全到半,1半到全,其他不转化

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function chgCase(sStr,iCase){
    if(typeof sStr != "string" || sStr.length <= 0 || !(iCase === 0 || iCase == 1)){
        return sStr;
    }
    var i,oRs=[],iCode;
    if(iCase){/*半->全*/
        for(i=0; i<sStr.length;i+=1){
            iCode = sStr.charCodeAt(i);
            if(iCode == 32){
                iCode = 12288;               
            }else if(iCode < 127){
                iCode += 65248;
            }
            oRs.push(String.fromCharCode(iCode));
        }       
    }else{/*全->半*/
        for(i=0; i<sStr.length;i+=1){
            iCode = sStr.charCodeAt(i);
            if(iCode == 12288){
                iCode = 32;
            }else if(iCode > 65280 && iCode < 65375){
                iCode -= 65248;               
            }
            oRs.push(String.fromCharCode(iCode));
        }       
    }       
    return oRs.join("");       
}

57、原生JavaScript确认是否键盘有效输入值

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function checkKey(iKey){
    if(iKey == 32 || iKey == 229){return true;}/*空格和异常*/
    if(iKey>47 && iKey < 58){return true;}/*数字*/
    if(iKey>64 && iKey < 91){return true;}/*字母*/
    if(iKey>95 && iKey < 108){return true;}/*数字键盘1*/
    if(iKey>108 && iKey < 112){return true;}/*数字键盘2*/
    if(iKey>185 && iKey < 193){return true;}/*符号1*/
    if(iKey>218 && iKey < 223){return true;}/*符号2*/
    return false;
}

58、原生JavaScript获取网页被卷去的位置

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function getScrollXY() {
    return document.body.scrollTop ? {
        x: document.body.scrollLeft,
        y: document.body.scrollTop
    }: {
        x: document.documentElement.scrollLeft,
        y: document.documentElement.scrollTop
    }
}

59、原生JavaScript另一种正则日期格式化函数+调用方法

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Date.prototype.format = function(format){ //author: meizz
  var o = {
    "M+" : this.getMonth()+1, //month
    "d+" : this.getDate(),    //day
    "h+" : this.getHours(),   //hour
    "m+" : this.getMinutes(), //minute
    "s+" : this.getSeconds(), //second
    "q+" : Math.floor((this.getMonth()+3)/3),  //quarter
    "S" : this.getMilliseconds() //millisecond
  }
  if(/(y+)/.test(format)) format=format.replace(RegExp.$1,
    (this.getFullYear()+"").substr(4 - RegExp.$1.length));
  for(var k in o)if(new RegExp("("+ k +")").test(format))
    format = format.replace(RegExp.$1,
      RegExp.$1.length==1 ? o[k] :
        ("00"+ o[k]).substr((""+ o[k]).length));
  return format;
}
alert(new Date().format("yyyy-MM-dd hh:mm:ss"));

60、原生JavaScript时间个性化输出功能

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/*
1、< 60s, 显示为“刚刚”
2、>= 1min && < 60 min, 显示与当前时间差“XX分钟前”
3、>= 60min && < 1day, 显示与当前时间差“今天 XX:XX”
4、>= 1day && < 1year, 显示日期“XX月XX日 XX:XX”
5、>= 1year, 显示具体日期“XXXX年XX月XX日 XX:XX”
 */
function timeFormat(time){
  var date = new Date(time)
    , curDate = new Date()
    , year = date.getFullYear()
    , month = date.getMonth() + 1
    , day = date.getDate()
    , hour = date.getHours()
    , minute = date.getMinutes()
    , curYear = curDate.getFullYear()
    , curHour = curDate.getHours()
    , timeStr;
  if(year < curYear){
    timeStr = year +'年'+ month +'月'+ day +'日 '+ hour +':'+ minute;
  }else{
    var pastTime = curDate - date
      , pastH = pastTime/3600000;
    if(pastH > curHour){
      timeStr = month +'月'+ day +'日 '+ hour +':'+ minute;
    }else if(pastH >= 1){
      timeStr = '今天 ' + hour +':'+ minute +'分';
    }else{
      var pastM = curDate.getMinutes() - minute;
      if(pastM > 1){
        timeStr = pastM +'分钟前';
      }else{
        timeStr = '刚刚';
      }
    }
  }
  return timeStr;
}

61、原生JavaScript解决offsetX兼容性问题

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// 针对火狐不支持offsetX/Y
function getOffset(e){
  var target = e.target, // 当前触发的目标对象
      eventCoord,
      pageCoord,
      offsetCoord;
  // 计算当前触发元素到文档的距离
  pageCoord = getPageCoord(target);
  // 计算光标到文档的距离
  eventCoord = {
    X : window.pageXOffset + e.clientX,
    Y : window.pageYOffset + e.clientY
  };
  // 相减获取光标到第一个定位的父元素的坐标
  offsetCoord = {
    X : eventCoord.X - pageCoord.X,
    Y : eventCoord.Y - pageCoord.Y
  };
  return offsetCoord;
}
function getPageCoord(element){
  var coord = { X : 0, Y : 0 };
  // 计算从当前触发元素到根节点为止,
  // 各级 offsetParent 元素的 offsetLeft 或 offsetTop 值之和
  while (element){
    coord.X += element.offsetLeft;
    coord.Y += element.offsetTop;
    element = element.offsetParent;
  }
  return coord;
}

62、原生JavaScript常用的正则表达式

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//正整数
/^[0-9]*[1-9][0-9]*$/;
//负整数
/^-[0-9]*[1-9][0-9]*$/;
//正浮点数
/^(([0-9]+.[0-9]*[1-9][0-9]*)|([0-9]*[1-9][0-9]*.[0-9]+)|([0-9]*[1-9][0-9]*))$/;  
//负浮点数
/^(-(([0-9]+.[0-9]*[1-9][0-9]*)|([0-9]*[1-9][0-9]*.[0-9]+)|([0-9]*[1-9][0-9]*)))$/; 
//浮点数
/^(-?d+)(.d+)?$/;
//email地址
/^[w-]+(.[w-]+)*@[w-]+(.[w-]+)+$/;
//url地址
/^[a-zA-z]+://(w+(-w+)*)(.(w+(-w+)*))*(?S*)?$/;
//年/月/日(年-月-日、年.月.日)
/^(19|20)dd[- /.](0[1-9]|1[012])[- /.](0[1-9]|[12][0-9]|3[01])$/;
//匹配中文字符
/[u4e00-u9fa5]/;
//匹配帐号是否合法(字母开头,允许5-10字节,允许字母数字下划线)
/^[a-zA-Z][a-zA-Z0-9_]{4,9}$/;
//匹配空白行的正则表达式
/ns*r/;
//匹配中国邮政编码
/[1-9]d{5}(?!d)/;
//匹配身份证
/d{15}|d{18}/;
//匹配国内电话号码
/(d{3}-|d{4}-)?(d{8}|d{7})?/;
//匹配IP地址
/((2[0-4]d|25[0-5]|[01]?dd?).){3}(2[0-4]d|25[0-5]|[01]?dd?)/;
//匹配首尾空白字符的正则表达式
/^s*|s*$/;
//匹配HTML标记的正则表达式
< (S*?)[^>]*>.*?|< .*? />;

63、原生JavaScript实现返回顶部的通用方法

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function backTop(btnId) {
    var btn = document.getElementById(btnId);
    var d = document.documentElement;
    var b = document.body;
    window.onscroll = set;
    btn.style.display = "none";
    btn.onclick = function() {
        btn.style.display = "none";
        window.onscroll = null;
        this.timer = setInterval(function() {
            d.scrollTop -= Math.ceil((d.scrollTop + b.scrollTop) * 0.1);
            b.scrollTop -= Math.ceil((d.scrollTop + b.scrollTop) * 0.1);
            if ((d.scrollTop + b.scrollTop) == 0) clearInterval(btn.timer, window.onscroll = set);
        },
        10);
    };
    function set() {
        btn.style.display = (d.scrollTop + b.scrollTop > 100) ? 'block': "none"
    }
};
backTop('goTop');

64、原生JavaScript获得URL中GET参数值

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// 用法:如果地址是 test.htm?t1=1&t2=2&t3=3, 那么能取得:GET["t1"], GET["t2"], GET["t3"]
function get_get(){
  querystr = window.location.href.split("?")
  if(querystr[1]){
    GETs = querystr[1].split("&")
    GET =new Array()
    for(i=0;i<GETs.length;i++){
      tmp_arr = GETs[i].split("=")
      key=tmp_arr[0]
      GET[key] = tmp_arr[1]
    }
  }
  return querystr[1];
}

65、原生JavaScript实现全选通用方法

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function checkall(form, prefix, checkall) {
    var checkall = checkall ? checkall : 'chkall';
    for(var i = 0; i < form.elements.length; i++) {
        var e = form.elements[i];
        if(e.type=="checkbox"){
            e.checked = form.elements[checkall].checked;
        }
    }
}

66、原生JavaScript实现全部取消选择通用方法

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function uncheckAll(form) {
    for (var i=0;i<form.elements.length;i++){
        var e = form.elements[i];
        if (e.name != 'chkall')
        e.checked=!e.checked;
    }
}

67、原生JavaScript实现打开一个窗体通用方法

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function openWindow(url,windowName,width,height){
    var x = parseInt(screen.width / 2.0) - (width / 2.0);
    var y = parseInt(screen.height / 2.0) - (height / 2.0);
    var isMSIE= (navigator.appName == "Microsoft Internet Explorer");
    if (isMSIE) {
        var p = "resizable=1,location=no,scrollbars=no,width=";
        p = p+width;
        p = p+",height=";
        p = p+height;
        p = p+",left=";
        p = p+x;
        p = p+",top=";
        p = p+y;
        retval = window.open(url, windowName, p);
    } else {
        var win = window.open(url, "ZyiisPopup", "top=" + y + ",left=" + x + ",scrollbars=" + scrollbars + ",dialog=yes,modal=yes,width=" + width + ",height=" + height + ",resizable=no" );
        eval("try { win.resizeTo(width, height); } catch(e) { }");
        win.focus();
    }
}

68、原生JavaScript判断是否为客户端设备

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function client(o){   
       var b = navigator.userAgent.toLowerCase();  
       var t = false;
       if (o == 'isOP'){
             t = b.indexOf('opera') > -1;
       }
       if (o == 'isIE'){
             t = b.indexOf('msie') > -1;
       }
       if (o == 'isFF'){
             t = b.indexOf('firefox') > -1;
       }
       return t;
}

69、原生JavaScript获取单选按钮的值

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function get_radio_value(field){
    if(field&&field.length){   
        for(var i=0;i<field.length;i++){       
            if(field[i].checked){           
                return field[i].value;                               
            }           
        }       
    }else {       
        return ;               
    }   
}

70、原生JavaScript获取复选框的值

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function get_checkbox_value(field){   
    if(field&&field.length){   
        for(var i=0;i<field.length;i++){           
            if(field[i].checked && !field[i].disabled){
                return field[i].value;
            }
        }       
    }else {
        return;
    }           
}

71、原生JavaScript判断是否为邮箱

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function isEmail(str){
    var re=/^w+((-w+)|(.w+))*@[A-Za-z0-9]+((.|-)[A-Za-z0-9]+)*.[A-Za-z0-9]+$/;
    if (re.test(str) != true) {
        return false;
    }else{
        return true;
    }   
}

72、原生JavaScript判断是否有列表中的危险字符

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function isValidReg(chars){
    var re=/<|>|[|]|{|}|『|』|※|○|●|◎|§|△|▲|☆|★|◇|◆|□|▼|㊣|﹋|⊕|⊙|〒|ㄅ|ㄆ|ㄇ|ㄈ|ㄉ|ㄊ|ㄋ|ㄌ|ㄍ|ㄎ|ㄏ|ㄐ|ㄑ|ㄒ|ㄓ|ㄔ|ㄕ|ㄖ|ㄗ|ㄘ|ㄙ|ㄚ|ㄛ|ㄜ|ㄝ|ㄞ|ㄟ|ㄢ|ㄣ|ㄤ|ㄥ|ㄦ|ㄧ|ㄨ|ㄩ|■|▄|▆|*|@|#|^|/;
    if (re.test( chars) == true) {
        return false;
    }else{
        return true;
    }   
}

73、原生JavaScript判断字符串是否大于规定的长度

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function isValidLength(chars, len) {
    if (chars.length < len) {
        return false;
    }
    return true;
}

74、原生JavaScript判断字符串是为网址不区分大小写

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function isValidURL( chars ) {
    var re=/^([hH][tT]{2}[pP]://|[hH][tT]{2}[pP][sS]://)(S+.S+)$/;
    if (!isNULL(chars)) {
        chars = jsTrim(chars);
        if (chars.match(re) == null)
            return false;
        else
            return true;
    }
    return false;
}

75、原生JavaScript判断字符串是否为小数

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function isValidDecimal( chars ) {
    var re=/^d*.?d{1,2}$/;
    if (chars.match(re) == null)
        return false;
    else
        return true;
}

76、原生JavaScript判断字符串是否为整数

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function isNumber( chars ) {
    var re=/^d*$/;
    if (chars.match(re) == null)
        return false;
    else
        return true;
}

77、原生JavaScript判断字符串是否为浮点数

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function isFloat( str ) {
    for(i=0;i<str.length;i++)  {
       if ((str.charAt(i)<"0" || str.charAt(i)>"9")&& str.charAt(i) != '.'){
            return false;
       }
    }
    return true;
}

78、原生JavaScript判断字符是否为A-Za-z英文字母

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function isLetters( str ){
    var re=/^[A-Za-z]+$/;
    if (str.match(re) == null)
        return false;
    else
        return true;
}

79、原生JavaScript判断字符串是否邮政编码

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function isValidPost( chars ) {
    var re=/^d{6}$/;
    if (chars.match(re) == null)
        return false;
    else
        return true;
}

80、原生JavaScript判断字符是否空NULL

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function isNULL( chars ) {
    if (chars == null)
        return true;
    if (jsTrim(chars).length==0)
        return true;
    return false;
}

81、原生JavaScript用正则表达式提取页面代码中所有网址

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var aa = document.documentElement.outerHTML.match(/(url(|src=|href=)["']*([^"'()<>[] ]+)["')]*|(http://[w-.]+[^"'()<>[] ]+)/ig).join("rn").replace(/^(src=|href=|url()["']*|["'>) ]*$/igm,"");
alert(aa)

82、原生JavaScript用正则表达式清除相同的数组(低效率)

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Array.prototype.unique=function(){
    return this.reverse().join(",").match(/([^,]+)(?!.*1)/ig).reverse();
}

83、原生JavaScript用正则表达式清除相同的数组(高效率)

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String.prototype.unique=function(){
    var x=this.split(/[rn]+/);
    var y='';
    for(var i=0;i<x.length;i++){
        if(!new RegExp("^"+x[i].replace(/([^w])/ig,"$1")+"$","igm").test(y)){
            y+=x[i]+"rn"
        }
    }
    return y
}

84、原生JavaScript用正则表达式按字母排序,对每行进行数组排序

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function SetSort(){
    var text=K1.value.split(/[rn]/).sort().join("rn");//顺序
    var test=K1.value.split(/[rn]/).sort().reverse().join("rn");//反序
    K1.value=K1.value!=text?text:test;
}

85、原生JavaScript字符串反序

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function IsReverse(text){
    return text.split('').reverse().join('');
}

86、原生JavaScript用正则表达式清除html代码中的脚本

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function clear_script(){
  K1.value=K1.value.replace(/<script.*?>[sS]*?</script>|s+on[a-zA-Z]{3,16}s?=s?"[sS]*?"|s+on[a-zA-Z]{3,16}s?=s?'[sS]*?'|s+on[a-zA-Z]{3,16}s?=[^ >]+/ig,"");
}

87、原生JavaScript动态执行JavaScript脚本

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function javascript(){
    try{
      eval(K1.value);
    }catch(e){
        alert(e.message);
    }
}

88、原生JavaScript动态执行VBScript脚本

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function vbscript(){
    try{
        var script=document.getElementById("K1").value;
        if(script.trim()=="")return;
        window.execScript('On Error Resume Next n'+script+'n If Err.Number<>0 Then n MsgBox "请输入正确的VBScript脚本!",48,"脚本错误!" n End If',"vbscript")
    }catch(e){
        alert(e.message);
    }
}

89、原生JavaScript实现金额大写转换函数

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function transform(tranvalue) {
  try {
    var i = 1;
    var dw2 = new Array("", "万", "亿"); //大单位
    var dw1 = new Array("拾", "佰", "仟"); //小单位
    var dw = new Array("零", "壹", "贰", "叁", "肆", "伍", "陆", "柒", "捌", "玖"); //整数部分用
    //以下是小写转换成大写显示在合计大写的文本框中    
    //分离整数与小数
    var source = splits(tranvalue);
    var num = source[0];
    var dig = source[1];
    //转换整数部分
    var k1 = 0; //计小单位
    var k2 = 0; //计大单位
    var sum = 0;
    var str = "";
    var len = source[0].length; //整数的长度
    for (i = 1; i <= len; i++) {
      var n = source[0].charAt(len - i); //取得某个位数上的数字
      var bn = 0;
      if (len - i - 1 >= 0) {
        bn = source[0].charAt(len - i - 1); //取得某个位数前一位上的数字
      }
      sum = sum + Number(n);
      if (sum != 0) {
        str = dw[Number(n)].concat(str); //取得该数字对应的大写数字,并插入到str字符串的前面
        if (n == '0') sum = 0;
      }
      if (len - i - 1 >= 0) { //在数字范围内
        if (k1 != 3) { //加小单位
          if (bn != 0) {
            str = dw1[k1].concat(str);
          }
          k1++;
        } else { //不加小单位,加大单位
          k1 = 0;
          var temp = str.charAt(0);
          if (temp == "万" || temp == "亿") //若大单位前没有数字则舍去大单位
          str = str.substr(1, str.length - 1);
          str = dw2[k2].concat(str);
          sum = 0;
        }
      }
      if (k1 == 3) //小单位到千则大单位进一
      {
        k2++;
      }
    }
    //转换小数部分
    var strdig = "";
    if (dig != "") {
      var n = dig.charAt(0);
      if (n != 0) {
        strdig += dw[Number(n)] + "角"; //加数字
      }
      var n = dig.charAt(1);
      if (n != 0) {
        strdig += dw[Number(n)] + "分"; //加数字
      }
    }
    str += "元" + strdig;
  } catch(e) {
    return "0元";
  }
  return str;
}
//拆分整数与小数
function splits(tranvalue) {
  var value = new Array('', '');
  temp = tranvalue.split(".");
  for (var i = 0; i < temp.length; i++) {
    value[i] = temp[i];
  }
  return value;
}

90、原生JavaScript常用的正则表达式大收集

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匹配中文字符的正则表达式: [u4e00-u9fa5]
匹配双字节字符(包括汉字在内):[^x00-xff]
匹配空行的正则表达式:n[s| ]*r
匹配 HTML 标记的正则表达式:<(.*)>.*</1>|<(.*) />
匹配首尾空格的正则表达式:(^s*)|(s*$)
匹配 IP 地址的正则表达式:/(d+).(d+).(d+).(d+)/g
匹配 Email 地址的正则表达式:w+([-+.]w+)*@w+([-.]w+)*.w+([-.]w+)*
匹配网址 URL 的正则表达式:http://(/[w-]+.)+[w-]+(/[w- ./?%&=]*)?
sql 语句:^(select|drop|delete|create|update|insert).*$
非负整数:^d+$
正整数:^[0-9]*[1-9][0-9]*$
非正整数:^((-d+)|(0+))$
负整数:^-[0-9]*[1-9][0-9]*$
整数:^-?d+$
非负浮点数:^d+(.d+)?$
正浮点数:^((0-9)+.[0-9]*[1-9][0-9]*)|([0-9]*[1-9][0-9]*.[0-9]+)|([0-9]*[1-9][0-9]*))$
非正浮点数:^((-d+.d+)?)|(0+(.0+)?))$
英文字符串:^[A-Za-z]+$
英文大写串:^[A-Z]+$
英文小写串:^[a-z]+$
英文字符数字串:^[A-Za-z0-9]+$
英数字加下划线串:^w+$
E-mail地址:^[w-]+(.[w-]+)*@[w-]+(.[w-]+)+$
URL:^[a-zA-Z]+://(w+(-w+)*)(.(w+(-w+)*))*(?s*)?$ 或:^http://[A-Za-z0-9]+.[A-Za-z0-9]+[/=?%-&_~`@[]':+!]*([^<>""])*$
邮政编码:^[1-9]d{5}$
电话号码:^(((d{2,3}))|(d{3}-))?((0d{2,3})|0d{2,3}-)?[1-9]d{6,7}(-d{1,4})?$
手机号码:^(((d{2,3}))|(d{3}-))?13d{9}$
双字节字符(包括汉字在内):^x00-xff
匹配首尾空格:(^s*)|(s*$)
匹配 HTML 标记:<(.*)>.*</1>|<(.*) />
匹配空行:n[s| ]*r
提取信息中的网络链接:(h|H)(r|R)(e|E)(f|F) *= *('|")?(w||/|.)+('|"| *|>)?
提取信息中的邮件地址:w+([-+.]w+)*@w+([-.]w+)*.w+([-.]w+)*
提取信息中的图片链接:(s|S)(r|R)(c|C) *= *('|")?(w||/|.)+('|"| *|>)?
提取信息中的 IP 地址:(d+).(d+).(d+).(d+)
提取信息中的中国手机号码:(86)*0*13d{9}
提取信息中的中国固定电话号码:((d{3,4})|d{3,4}-|s)?d{8}
提取信息中的中国电话号码(包括移动和固定电话):((d{3,4})|d{3,4}-|s)?d{7,14}
提取信息中的中国邮政编码:[1-9]{1}(d+){5}
提取信息中的浮点数(即小数):(-?d*).?d+
提取信息中的任何数字 :(-?d*)(.d+)?
IP:(d+).(d+).(d+).(d+)
电话区号:^0d{2,3}$
腾讯 QQ 号:^[1-9]*[1-9][0-9]*$
帐号(字母开头,允许 5-16 字节,允许字母数字下划线):^[a-zA-Z][a-zA-Z0-9_]{4,15}$
中文、英文、数字及下划线:^[u4e00-u9fa5_a-zA-Z0-9]+$

91、原生JavaScript实现窗体改变事件resize的操作(兼容所以的浏览器)

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(function(){
    var fn = function(){
        var w = document.documentElement ? document.documentElement.clientWidth : document.body.clientWidth
            ,r = 1255
            ,b = Element.extend(document.body)
            ,classname = b.className;
        if(w < r){
            //当窗体的宽度小于1255的时候执行相应的操作
        }else{
            //当窗体的宽度大于1255的时候执行相应的操作
        }
    }
    if(window.addEventListener){
        window.addEventListener('resize', function(){ fn(); });
    }else if(window.attachEvent){
        window.attachEvent('onresize', function(){ fn(); });
    }
    fn();
})();

92、原生JavaScript用正则清除空格分左右

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function ltrim(s){ return s.replace( /^(s*| *)/, ""); }
function rtrim(s){ return s.replace( /(s*| *)$/, ""); }
function trim(s){ return ltrim(rtrim(s));}

93、原生JavaScript判断变量是否空值

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/**
 * 判断变量是否空值
 * undefined, null, '', false, 0, [], {} 均返回true,否则返回false
 */
function empty(v){
    switch (typeof v){
        case 'undefined' : return true;
        case 'string'    : if(trim(v).length == 0) return true; break;
        case 'boolean'   : if(!v) return true; break;
        case 'number'    : if(0 === v) return true; break;
        case 'object'    :
            if(null === v) return true;
            if(undefined !== v.length && v.length==0) return true;
            for(var k in v){return false;} return true;
            break;
    }
    return false;
}

94、原生JavaScript实现base64解码

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function base64_decode(data){
    var b64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
    var o1, o2, o3, h1, h2, h3, h4, bits, i = 0,ac = 0,dec = "",tmp_arr = [];
    if (!data) { return data; }
    data += '';
    do {
        h1 = b64.indexOf(data.charAt(i++));
        h2 = b64.indexOf(data.charAt(i++));
        h3 = b64.indexOf(data.charAt(i++));
        h4 = b64.indexOf(data.charAt(i++));
        bits = h1 << 18 | h2 << 12 | h3 << 6 | h4;
        o1 = bits >> 16 & 0xff;
        o2 = bits >> 8 & 0xff;
        o3 = bits & 0xff;
        if (h3 == 64) {
            tmp_arr[ac++] = String.fromCharCode(o1);
        } else if (h4 == 64) {
            tmp_arr[ac++] = String.fromCharCode(o1, o2);
        } else {
            tmp_arr[ac++] = String.fromCharCode(o1, o2, o3);
        }
    } while (i < data.length);
    dec = tmp_arr.join('');
    dec = utf8_decode(dec);
    return dec;
}

95、原生JavaScript实现utf8解码

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function utf8_decode(str_data){
    var tmp_arr = [],i = 0,ac = 0,c1 = 0,c2 = 0,c3 = 0;str_data += '';
    while (i < str_data.length) {
        c1 = str_data.charCodeAt(i);
        if (c1 < 128) {
            tmp_arr[ac++] = String.fromCharCode(c1);
            i++;
        } else if (c1 > 191 && c1 < 224) {      
            c2 = str_data.charCodeAt(i + 1);
            tmp_arr[ac++] = String.fromCharCode(((c1 & 31) << 6) | (c2 & 63));
            i += 2;
        } else {
            c2 = str_data.charCodeAt(i + 1);
            c3 = str_data.charCodeAt(i + 2);
            tmp_arr[ac++] = String.fromCharCode(((c1 & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
            i += 3;
        }
    }
    return tmp_arr.join('');
}

96、原生JavaScript获取窗体可见范围的宽与高

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function getViewSize(){
    var de=document.documentElement;
    var db=document.body;
    var viewW=de.clientWidth==0 ?  db.clientWidth : de.clientWidth;
    var viewH=de.clientHeight==0 ?  db.clientHeight : de.clientHeight;
    return Array(viewW ,viewH);
}

97、原生JavaScript判断IE版本号(既简洁、又向后兼容!)

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var _IE = (function(){
    var v = 3, div = document.createElement('div'), all = div.getElementsByTagName('i');
    while (
        div.innerHTML = '<!--[if gt IE ' + (++v) + ']><i></i><![endif]-->',
        all[0]
    );
    return v > 4 ? v : false ;
}());

98、原生JavaScript获取浏览器版本号

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function browserVersion(types) {
    var other = 1;
    for (i in types) {
        var v = types[i] ? types[i] : i;
        if (USERAGENT.indexOf(v) != -1) {
            var re = new RegExp(v + '(/|s|:)([d.]+)', 'ig');
            var matches = re.exec(USERAGENT);
            var ver = matches != null ? matches[2] : 0;
            other = ver !== 0 && v != 'mozilla' ? 0 : other;
        } else {
            var ver = 0;
        }
        eval('BROWSER.' + i + '= ver');
    }
    BROWSER.other = other;
}

99、原生JavaScript半角转换为全角函数

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function ToDBC(str){
  var result = '';
  for(var i=0; i < str.length; i++){
    code = str.charCodeAt(i);
    if(code >= 33 && code <= 126){
      result += String.fromCharCode(str.charCodeAt(i) + 65248);
    }else if (code == 32){
      result += String.fromCharCode(str.charCodeAt(i) + 12288 - 32);
    }else{
      result += str.charAt(i);
    }
  }
 return result;
}

100、原生JavaScript全角转换为半角函数

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function ToCDB(str){
  var result = '';
  for(var i=0; i < str.length; i++){
    code = str.charCodeAt(i);
    if(code >= 65281 && code <= 65374){
      result += String.fromCharCode(str.charCodeAt(i) - 65248);
    }else if (code == 12288){
      result += String.fromCharCode(str.charCodeAt(i) - 12288 + 32);
    }else{
      result += str.charAt(i);
    }
  }
 return result;
}

 

4条评论

  1. 100个直接可以拿来用的JavaScript实用功能代码片段
    avatar
    友链 1楼

    好长好长,总结的太多啦

    • 100个直接可以拿来用的JavaScript实用功能代码片段
      avatar
      Lv.6 1楼-1

      转载的。。。。。

  2. 100个直接可以拿来用的JavaScript实用功能代码片段
    avatar

    你肿么把出处给干掉了?

    • 100个直接可以拿来用的JavaScript实用功能代码片段
      avatar
      Lv.6 2楼-1

      。。来源于网络。。。我无耻了。。

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