JS常用方法总结（来自网络整理）

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，汉字计数为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2elsea++;}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);

 

 

 

 

未完待续。