JavaScript 常用方法总结

1.手机类型判断

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)),}

2.返回字符串长度，汉子计数为2

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;}

3.获取url中的参数

function GetQueryStringRegExp(name,url) {var reg = new RegExp("(^|\?|&)" + name + "=([^&]*)(\s|&|$)", "i");if (reg.test(url)) return decodeURIComponent(RegExp.$2.replace(/+/g, " ")); return "";}　

4.js绑定事件适用于任何浏览器的元素绑定

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);

5.获得当前浏览器JS的版本

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;}　　

6.获取当前点击事件的Object对象

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;};　

7.字符串截取方法

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;}　　

8.JS弹出新窗口全屏

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();　

9. 全选/全不选

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);       }   }

10. js判断浏览器

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″);}}　　

11.判断浏览器

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";}}

12.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

//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;           }       }   }　

13.移除事件

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;}}　

14.回车提交

$("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();}}

15.JS 执行计时器

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

16.JS 写Cookie

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;};　　

17. JS读Cookie

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}

18. Ajax请求

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();};　　

19. JS StringBuilder 用法

function StringBuilder() {this.strings = new Array;};StringBuilder.prototype.append = function (str) {this.strings.push(str);};StringBuilder.prototype.toString = function () {return this.strings.join('');};

20. JS加载到顶部LoadJS

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);}　　

21.清空LoadJS加载到顶部的js引用

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);};　　

22. JS替换非法字符主要用在密码验证上出现的特殊字符

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

23. 按Ctrl + Entert 直接提交表单

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();}};　

24.获取当前时间

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;}

25. Js去掉空格方法

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, "");}　

26. Js动态移除head里的js引用

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);};　

27.整个UL点击事件 加在UL里的onclick里

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();};

28. 判断浏览器使用的是哪个 JS 版本

<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);