28个常用JavaScript方法集锦

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)),
}

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;
}

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

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);

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;
}

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;
};

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;
 }

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();

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);
 }
 }

 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”);
 }

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″);
 }
}

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";
 }
}

//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;
 }
 }
 }

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;
 }
}

$("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();
 }
}

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

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;
};

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
}

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();
};

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

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);
 }

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);
 };　

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

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();
 }
}

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;
 }

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, "");

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);
};

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();
 };