28个常用JavaScript方法集锦 经常使用的 JS 方法，今天记下，以便以后查询手机类型判断代码如下: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) { $("SubmitLogin").onclick(); } }JS 执行计时器代码如下:timeStart = new Date().getTime(); timesEnd = new Date().getTime(); document.getElementById("time").innerHTML = timesEnd - timeStart;JS 写Cookie代码如下:function setCookie(name, value, expires, path, domain) { if (!expires) expires = -1; if (!path) path = "/"; var d = "" + name + "=" + value; var e; if (expires < 0) { e = ""; } else if (expires == 0) { var f = new Date(1970, 1, 1); e = ";expires=" + f.toUTCString(); } else { var now = new Date(); var f = new Date(now.getTime() + expires * 1000); e = ";expires=" + f.toUTCString(); } var dm; if (!domain) { dm = ""; } else { dm = ";domain=" + domain; } document.cookie = name + "=" + value + ";path=" + path + e + dm; };JS 读Cookie代码如下:function readCookie(name) { var nameEQ = name + "="; var ca = document.cookie.split(';'); for (var i = 0; i < ca.length; i++) { var c = ca[i]; while (c.charAt(0) == ' ') c = c.substring(1, c.length); if (c.indexOf(nameEQ) == 0) { return decodeURIComponent(c.substring(nameEQ.length, c.length)) } } return null }Ajax 请求代码如下:C.ajax = function (args) { var self = this; this.options = { type: 'GET', async: true, contentType: 'application/x-www-form-urlencoded', url: 'about:blank', data: null, success: {}, error: {} }; this.getXmlHttp = function () { var xmlHttp; try { xmlhttp = new XMLHttpRequest(); } catch (e) { try { xmlhttp = new ActiveXObject("Msxml2.XMLHTTP"); } catch (e) { xmlHttp = new ActiveXObject("Microsoft.XMLHTTP"); } } if (!xmlhttp) { alert('您的浏览器不支持AJAX'); return false; } return xmlhttp; }; this.send = function () { C.each(self.options, function (key, val) { self.options[key] = (args[key] == null) ? val : args[key]; }); var xmlHttp = new self.getXmlHttp(); if (self.options.type.toUpperCase() == 'GET') { xmlHttp.open(self.options.type, self.options.url + (self.options.data == null ? "" : ((/[?]$/.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：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);