28个常用JavaScript方法集锦

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我是靠谱客的博主外向冬天，最近开发中收集的这篇文章主要介绍28个常用JavaScript方法集锦，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

经常使用的 JS 方法，今天记下，以便以后查询

/* 手机类型判断 */

复制代码代码如下:

var BrowserInfo = {

    userAgent: navigator.userAgent.toLowerCase()

    isAndroid: Boolean(navigator.userAgent.match(/android/ig)),

    isIphone: Boolean(navigator.userAgent.match(/iphone|ipod/ig)),

    isIpad: Boolean(navigator.userAgent.match(/ipad/ig)),

    isWeixin: Boolean(navigator.userAgent.match(/MicroMessenger/ig)),

}

/* 返回字符串长度，汉子计数为2 */

复制代码代码如下:

function strLength(str) {

    var a = 0;

    for (var i = 0; i < str.length; i++) {

        if (str.charCodeAt(i) > 255)

            a += 2;//按照预期计数增加2

        else

            a++;

    }

    return a;

}

获取url中的参数

复制代码代码如下:

function GetQueryStringRegExp(name,url) {

    var reg = new RegExp("(^|\?|&)" + name + "=([^&]*)(\s|&|$)", "i");

    if (reg.test(url)) return decodeURIComponent(RegExp.$2.replace(/+/g, " ")); return "";

}

/* js 绑定事件适用于任何浏览器的元素绑定 */

复制代码代码如下:

function eventBind(obj, eventType, callBack) {

        if (obj.addEventListener) {

            obj.addEventListener(eventType, callBack, false);

        }

        else if (window.attachEvent) {

            obj.attachEvent('on' + eventType, callBack);

        }

        else {

            obj['on' + eventType] = callBack;

        }

    };

eventBind(document, 'click', bodyClick);

/* 获得当前浏览器JS的版本 */

复制代码代码如下:

function getjsversion(){

    var n = navigator;

    var u = n.userAgent;

    var apn = n.appName;

    var v = n.appVersion;

    var ie = v.indexOf('MSIE ');

    if (ie > 0){

        apv = parseInt(i = v.substring(ie + 5));

        if (apv > 3) {

            apv = parseFloat(i);

        }

    } else {

        apv = parseFloat(v);

    }

    var isie = (apn == 'Microsoft Internet Explorer');

    var ismac = (u.indexOf('Mac') >= 0);

    var javascriptVersion = "1.0";

    if (String && String.prototype) {

        javascriptVersion = '1.1';

        if (javascriptVersion.match) {

            javascriptVersion = '1.2';

            var tm = new Date;

            if (tm.setUTCDate) {

                javascriptVersion = '1.3';

                if (isie && ismac && apv >= 5) javascriptVersion = '1.4';

                var pn = 0;

                if (pn.toPrecision) {

                    javascriptVersion = '1.5';

                    a = new Array;

                    if (a.forEach) {

                        javascriptVersion = '1.6';

                        i = 0;

                        o = new Object;

                        tcf = new Function('o', 'var e,i=0;try{i=new Iterator(o)}catch(e){}return i');

                        i = tcf(o);

                        if (i && i.next) {

                            javascriptVersion = '1.7';

                        }

                    }

                }

            }

        }

    }

    return javascriptVersion;

}

/* 获取当前点击事件的Object对象 */

复制代码代码如下:

function getEvent() {

    if (document.all) {

        return window.event; //如果是ie

    }

    func = getEvent.caller;

    while (func != null) {

        var arg0 = func.arguments[0];

        if (arg0) {

            if ((arg0.constructor == Event || arg0.constructor == MouseEvent)

|| (typeof (arg0) == "object" && arg0.preventDefault && arg0.stopPropagation)) {

                return arg0;

            }

        }

        func = func.caller;

    }

    return null;

};

/* 字符串截取方法 */

复制代码代码如下:

getCharactersLen: function (charStr, cutCount) {

        if (charStr == null || charStr == '') return '';

        var totalCount = 0;

        var newStr = '';

        for (var i = 0; i < charStr.length; i++) {

            var c = charStr.charCodeAt(i);

            if (c < 255 && c > 0) {

                totalCount++;

            } else {

                totalCount += 2;

            }

            if (totalCount >= cutCount) {

                newStr += charStr.charAt(i);

                break;

            }

            else {

                newStr += charStr.charAt(i);

            }

        }

        return newStr;

    }

/* JS 弹出新窗口全屏 */

复制代码代码如下:

var tmp = window.open("about:blank", "", "fullscreen=1")

                            tmp.moveTo(0, 0);

                            tmp.resizeTo(screen.width + 20, screen.height);

                            tmp.focus();

                            tmp.location.href = 'http://www.che168.com/pinggu/eva_' + msgResult.message[0] + '.html';

var config_ = "left=0,top=0,width=" + (window.screen.Width) + ",height=" + (window.screen.Height);

                            window.open('http://www.che168.com/pinggu/eva_' + msgResult.message[0] + '.html', "winHanle", config_);

//模拟form提交打开新页面

var f = document.createElement("form");

                            f.setAttribute('action', 'http://www.che168.com/pinggu/eva_' + msgResult.message[0] + '.html');

                            f.target = '_blank';

                            document.body.appendChild(f);

                            f.submit();

/* 全选/全不选 */

复制代码代码如下:

function selectAll(objSelect) {

            if (objSelect.checked == true) {

                $("input[name='chkId']").attr("checked", true);

                $("input[name='chkAll']").attr("checked", true);

            }

            else if (objSelect.checked == false) {

                $("input[name='chkId']").attr("checked", false);

                $("input[name='chkAll']").attr("checked", false);

            }

        }

/* js 判断浏览器 */

复制代码代码如下:

判断是否是 IE 浏览器

    if (document.all){

        alert(”IE浏览器”);

    }else{

        alert(”非IE浏览器”);

    }

    if (!!window.ActiveXObject){

        alert(”IE浏览器”);

    }else{

        alert(”非IE浏览器”);

    }

判断是IE几

var isIE=!!window.ActiveXObject;

var isIE6=isIE&&!window.XMLHttpRequest;

var isIE8=isIE&&!!document.documentMode;

var isIE7=isIE&&!isIE6&&!isIE8;

if (isIE){

    if (isIE6){

        alert(”ie6″);

    }else if (isIE8){

        alert(”ie8″);

    }else if (isIE7){

        alert(”ie7″);

    }

}

/* 判断浏览器 */

复制代码代码如下:

function getOs() {

    if (navigator.userAgent.indexOf("MSIE 8.0") > 0) {

        return "MSIE8";

    }

    else if (navigator.userAgent.indexOf("MSIE 6.0") > 0) {

        return "MSIE6";

    }

    else if (navigator.userAgent.indexOf("MSIE 7.0") > 0) {

        return "MSIE7";

    }

    else if (isFirefox = navigator.userAgent.indexOf("Firefox") > 0) {

        return "Firefox";

    }

    if (navigator.userAgent.indexOf("Chrome") > 0) {

        return "Chrome";

    }

    else {

        return "Other";

    }

}

/* JS判断两个日期大小适合 2012-09-09 与2012-9-9 两种格式的对比 */

复制代码代码如下:

//得到日期值并转化成日期格式，replace(/-/g, "/")是根据验证表达式把日期转化成长日期格式，这样再进行判断就好判断了

        function ValidateDate() {

            var beginDate = $("#t_datestart").val();

            var endDate = $("#t_dateend").val();

            if (beginDate.length > 0 && endDate.length>0) {

                var sDate = new Date(beginDate.replace(/-/g, "/"));

                var eDate= new Date(endDate.replace(/-/g, "/"));

                if (sDate > eDate) {

                    alert('开始日期要小于结束日期');

                    return false;

                }

            }

        }

/* 移除事件 */

复制代码代码如下:

this.moveBind = function (objId, eventType, callBack) {

    var obj = document.getElementById(objId);

    if (obj.removeEventListener) {

        obj.removeEventListener(eventType, callBack, false);

    }

    else if (window.detachEvent) {

        obj.detachEvent('on' + eventType, callBack);

    }

    else {

        obj['on' + eventType] = null;

    }

}

/* 回车提交 */

复制代码代码如下:

$("id").onkeypress = function (event) {

    event = (event) ? event : ((window.event) ? window.event : "")

    keyCode = event.keyCode ? event.keyCode : (event.which ? event.which : event.charCode);

    if (keyCode == 13) {

        $("SubmitLogin").onclick();

    }

}

/* JS 执行计时器 */

复制代码代码如下:

timeStart = new Date().getTime();

timesEnd = new Date().getTime();

document.getElementById("time").innerHTML = timesEnd - timeStart;

/* JS 写Cookie */

复制代码代码如下:

function setCookie(name, value, expires, path, domain) {

    if (!expires) expires = -1;

    if (!path) path = "/";

    var d = "" + name + "=" + value;

    var e;

    if (expires < 0) {

        e = "";

    }

    else if (expires == 0) {

        var f = new Date(1970, 1, 1);

        e = ";expires=" + f.toUTCString();

    }

    else {

        var now = new Date();

        var f = new Date(now.getTime() + expires * 1000);

        e = ";expires=" + f.toUTCString();

    }

    var dm;

    if (!domain) {

        dm = "";

    }

    else {

        dm = ";domain=" + domain;

    }

    document.cookie = name + "=" + value + ";path=" + path + e + dm;

};

/* JS 读Cookie */

复制代码代码如下:

function readCookie(name) {

    var nameEQ = name + "=";

    var ca = document.cookie.split(';');

    for (var i = 0; i < ca.length; i++) {

        var c = ca[i];

        while (c.charAt(0) == ' ') c = c.substring(1, c.length);

        if (c.indexOf(nameEQ) == 0) {

            return decodeURIComponent(c.substring(nameEQ.length, c.length))

        }

    } return null

}

/* Ajax 请求 */

复制代码代码如下:

C.ajax = function (args) {

    var self = this;

    this.options = {

        type: 'GET',

        async: true,

        contentType: 'application/x-www-form-urlencoded',

        url: 'about:blank',

        data: null,

        success: {},

        error: {}

    };

    this.getXmlHttp = function () {

        var xmlHttp;

        try {

            xmlhttp = new XMLHttpRequest();

        }

        catch (e) {

            try {

                xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");

            }

            catch (e) {

                xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");

            }

        }

        if (!xmlhttp) {

            alert('您的浏览器不支持AJAX');

            return false;

        }

        return xmlhttp;

    };

    this.send = function () {

        C.each(self.options, function (key, val) {

            self.options[key] = (args[key] == null) ? val : args[key];

        });

        var xmlHttp = new self.getXmlHttp();

        if (self.options.type.toUpperCase() == 'GET') {

            xmlHttp.open(self.options.type, self.options.url + (self.options.data == null ? "" : ((/[?]$/.test(self.options.url) ? '&' : '?') + self.options.data)), self.options.async);

        }

        else {

            xmlHttp.open(self.options.type, self.options.url, self.options.async);

            xmlHttp.setRequestHeader('Content-Length', self.options.data.length);

        }

        xmlHttp.setRequestHeader('Content-Type', self.options.contentType);

        xmlHttp.onreadystatechange = function () {

            if (xmlHttp.readyState == 4) {

                if (xmlHttp.status == 200 || xmlHttp.status == 0) {

                    if (typeof self.options.success == 'function') self.options.success(xmlHttp.responseText);

                    xmlHttp = null;

                }

                else {

                    if (typeof self.options.error == 'function') self.options.error('Server Status: ' + xmlHttp.status);

                }

            }

        };

        xmlHttp.send(self.options.type.toUpperCase() == 'POST' ? self.options.data.toString() : null);

    };

    this.send();

};

/* JS StringBuilder 用法 */

复制代码代码如下:

function StringBuilder() {

    this.strings = new Array;

};

StringBuilder.prototype.append = function (str) {

    this.strings.push(str);

};

StringBuilder.prototype.toString = function () {

    return this.strings.join('');

};

/* JS 加载到顶部LoadJS */

复制代码代码如下:

function loadJS (url, fn) {

        var ss = document.getElementsByName('script'),

            loaded = false;

        for (var i = 0, len = ss.length; i < len; i++) {

            if (ss[i].src && ss[i].getAttribute('src') == url) {

                loaded = true;

                break;

            }

        }

        if (loaded) {

            if (fn && typeof fn != 'undefined' && fn instanceof Function) fn();

            return false;

        }

        var s = document.createElement('script'),

            b = false;

        s.setAttribute('type', 'text/javascript');

        s.setAttribute('src', url);

        s.onload = s.onreadystatechange = function () {

            if (!b && (!this.readyState || this.readyState == 'loaded' || this.readyState == 'complete')) {

                b = true;

                if (fn && typeof fn != 'undefined' && fn instanceof Function) fn();

            }

        };

        document.getElementsByTagName('head')[0].appendChild(s);

    },

    bind: function (objId, eventType, callBack) {  //适用于任何浏览器的绑定

        var obj = document.getElementById(objId);

        if (obj.addEventListener) {

            obj.addEventListener(eventType, callBack, false);

        }

        else if (window.attachEvent) {

            obj.attachEvent('on' + eventType, callBack);

        }

        else {

            obj['on' + eventType] = callBack;

        }

    }

function JSLoad (args) {

        s = document.createElement("script");

        s.setAttribute("type", "text/javascript");

        s.setAttribute("src", args.url);

        s.onload = s.onreadystatechange = function () {

            if (!s.readyState || s.readyState == "loaded" || s.readyState == "complete") {

                if (typeof args.callback == "function") args.callback(this, args);

                s.onload = s.onreadystatechange = null;

                try {

                    s.parentNode && s.parentNode.removeChild(s);

                } catch (e) { }

            }

        };

        document.getElementsByTagName("head")[0].appendChild(s);

    }

/* 清空 LoadJS 加载到顶部的js引用 */

复制代码代码如下:

function ClearHeadJs  (src) {

        var js = document.getElementsByTagName('head')[0].children;

        var obj = null;

        for (var i = 0; i < js.length; i++) {

            if (js[i].tagName.toLowerCase() == "script" && js[i].attributes['src'].value.indexOf(src) > 0) {

                obj = js[i];

            }

        }

        document.getElementsByTagName('head')[0].removeChild(obj);

    };

/* JS 替换非法字符主要用在密码验证上出现的特殊字符 */

复制代码代码如下:

function URLencode(sStr) {

    return escape(sStr).replace(/+/g, '%2B').replace(/"/g, '%22').replace(/'/g, '%27').replace(///g, '%2F');

};

/* 按Ctrl + Entert 直接提交表单 */

复制代码代码如下:

document.body.onkeydown = function (evt) {

    evt = evt ? evt : (window.event ? window.event : null);

    if (13 == evt.keyCode && evt.ctrlKey) {

        evt.returnValue = false;

        evt.cancel = true;

        PostData();

    }

};

　　
/* 获取当前时间 */

复制代码代码如下:

function GetCurrentDate() {

        var d = new Date();

        var y = d.getYear()+1900;

        month = add_zero(d.getMonth() + 1),

        days = add_zero(d.getDate()),

        hours = add_zero(d.getHours());

        minutes = add_zero(d.getMinutes()),

        seconds = add_zero(d.getSeconds());

        var str = y + '-' + month + '-' + days + ' ' + hours + ':' + minutes + ':' + seconds;

        return str;

    };

    function add_zero(temp) {

        if (temp < 10) return "0" + temp;

        else return temp;

    }

　　
/* Js 去掉空格方法： */

复制代码代码如下:

String.prototype.Trim = function()

{ return this.replace(/(^s*)|(s*$)/g, ""); }

String.prototype.LTrim = function()

{return this.replace(/(^s*)/g, "");}

String.prototype.RTrim = function()

{return this.replace(/(s*$)/g, "");}

/* js 动态移除 head 里的 js 引用 */

复制代码代码如下:

this.ClearHeadJs = function (src) {

    var js = document.getElementsByTagName('head')[0].children;

    var obj = null;

    for (var i = 0; i < js.length; i++) {

        if (js[i].tagName.toLowerCase() == "script" && js[i].attributes['src'].value.indexOf(src) > 0) {

            obj = js[i];

        }

    }

    document.getElementsByTagName('head')[0].removeChild(obj);

};

/* 整个UL 点击事件加在UL里的onclick里 */

复制代码代码如下:

function CreateFrom(url, params) {

     var f = document.createElement("form");

     f.setAttribute("action", url);

     for (var i = 0; i < params.length; i++) {

         var input = document.createElement("input");

         input.setAttribute("type", "hidden");

         input.setAttribute("name", params[i].paramName);

         input.setAttribute("value", params[i].paramValue);

         f.appendChild(input);

     }

     f.target = "_blank";

     document.body.appendChild(f);

     f.submit();

 };

/* 判断浏览器使用的是哪个 JS 版本 */

复制代码代码如下:

<script language="javascript">

      var jsversion = 1.0;

    </script>

    <script language="javascript1.1">

      jsversion = 1.1;

    </script>

    <script language="javascript1.2">

      jsversion = 1.2;

    </script>

    <script language="javascript1.3">

      jsversion = 1.3;

    </script>

    <script language="javascript1.4">

      jsversion = 1.4;

    </script>

    <script language="javascript1.5">

      jsversion = 1.5;

    </script>

    <script language="javascript1.6">

      jsversion = 1.6;

    </script>

    <script language="javascript1.7">

      jsversion = 1.7;

    </script>

    <script language="javascript1.8">

      jsversion = 1.8;

    </script>

    <script language="javascript1.9">

      jsversion = 1.9;

    </script>

    <script language="javascript2.0">

      jsversion = 2.0;

    </script>

alert(jsversion);