兼容IE,FireFox,Chrome和Safari的Ajax
自己封装的ajax方法，兼容IE,FireFox,Chrome,Fafari等浏览器。方法内包括http请求发送和返回responose xml接收。
/* author: linyang date: 2012-01-30*/var myAjax = (function(){ /* paramObj:{ url: request url, method: GET or POST, encode: character } return xmlDOMParser */ var _send_synchronous = function(paramObj){ var url, method, encode,httpRequest,parser; url = paramObj.url; method = paramObj.method; encode = paramObj.encode; if(typeof method == 'undefined') method = 'GET'; if (window.ActiveXObject) {//IE httpRequest = new ActiveXObject("Microsoft.XMLHTTP"); } else {//FireFox,Chrome,Safari httpRequest = new XMLHttpRequest(); } httpRequest.open(method, url, false); if(typeof encode != 'undefined') httpRequest.setRequestHeader("Content-Type", "text/html;charset="+encode); httpRequest.send(); if (window.ActiveXObject) {//IE parser = new ActiveXObject("Microsoft.XMLDOM"); parser.async = false; parser.load(httpRequest.responseXML); } else if (document.implementation.createDocument) { try {//FireFox parser = document.implementation.createDocument("", "", null); parser.async = false; parser = (new DOMParser()).parseFromString(httpRequest.responseText, "text/xml"); } catch(e) {//Chrome,Safari var xmlhttp = new window.XMLHttpRequest(); xmlhttp.open("GET", httpRequest.responseText, false); xmlhttp.send(null); parser = xmlhttp.responseXML.documentElement; } } return parser; } /* paramObj:{ url: request url, method: GET or POST, encode: character, param: post param, isAsync: boolean, parserHandler: function } */ var _send_ajax = function(paramObj){ var url,method,encode,httpRequest,param,isAsync,parser; var parserHandler; url = paramObj.url; method = paramObj.method.toUpperCase(); encode = paramObj.encode; if(method=='GET') param = null; else if(method=='POST') param = paramObj.param; isAsync = paramObj.isAsync; parserHandler = paramObj.parserHandler; if (window.ActiveXObject) {//IE httpRequest = new ActiveXObject("Microsoft.XMLHTTP"); } else {//FireFox,Chrome,Safari httpRequest = new XMLHttpRequest(); } httpRequest.onreadystatechange = function(){ if(httpRequest.readyState==4){ if(httpRequest.status==200){ if (window.ActiveXObject) {//IE parser = new ActiveXObject("Microsoft.XMLDOM"); parser.async = false; parser.load(httpRequest.responseXML); } else if (document.implementation.createDocument) { try {//FireFox parser = document.implementation.createDocument("", "", null); parser.async = false; parser = (new DOMParser()).parseFromString(httpRequest.responseText, "text/xml"); } catch(e) {//Chrome,Safari var xmlhttp = new window.XMLHttpRequest(); xmlhttp.open("GET", httpRequest.responseText, false); xmlhttp.send(null); parser = xmlhttp.responseXML.documentElement; } } parserHandler.apply(parser,[]); }else{ alert("远程服务调用失败！"); } } } httpRequest.open(method, url, isAsync); if(typeof encode != 'undefined') if(method=='GET') httpRequest.setRequestHeader("Content-Type", "text/html;charset="+encode); else if(method=='POST') httpRequest.setRequestHeader("Content-Type","application/x-www-form-urlencoded; charset="+encode); httpRequest.send(param); } return { sendSynchronize:_send_synchronous, sendAjax:_send_ajax }})(); myAjax.sendAjax({url:"PointTransAction.do",method:'POST',encode:'GBK',param:"giftid=" + id + "&time=" + new Date(),isAsync:true,parserHandler:function(){var flag = this.getElementsByTagName('ret')[0].getAttribute('flag');var msg = this.getElementsByTagName('ret')[0].getAttribute('msg');if (flag == '0')//do something elsealert(msg);}});