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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en"> <head> <meta http-equiv="Content-Type" content="text/html;charset=UTF-8"> <title>jsonp</title> </head> <body> <script type="text/javascript" src="jquery-1.6.2.js"></script> <!-- <script type="text/javascript" src="jquery-1.11.1.js"></script> --> <script type="text/javascript"> /*Ajax = function(){ function request(url,opt){ function fn(){} var async = opt.async !== false, method = opt.method || ‘GET‘, data = opt.data || null, success = opt.success || fn, failure = opt.failure || fn; method = method.toUpperCase(); if(method == ‘GET‘ && data){ url += (url.indexOf(‘?‘) == -1 ? ‘?‘ : ‘&‘) + data; data = null; } var xhr = window.XMLHttpRequest ? new XMLHttpRequest() : new ActiveXObject(‘Microsoft.XMLHTTP‘); xhr.onreadystatechange = function(){ _onStateChange(xhr,success,failure); }; xhr.open(method,url,async); if(method == ‘POST‘){ xhr.setRequestHeader(‘Content-type‘, ‘application/x-www-form-urlencoded;‘); } xhr.send(data); return xhr; } function _onStateChange(xhr,success,failure){ if(xhr.readyState == 4){ var s = xhr.status; if(s>= 200 && s < 300){ success(xhr); }else{ failure(xhr); } }else{} } return {request:request}; }();*/ </script> <script type="text/javascript"> (function(root){ if(typeof(Ajax)=="undefined"&&!Ajax) var Ajax={}; Ajax.request=function(obj){ var xhr=new Ajax.creat(); return xhr.request(obj); } Ajax.creat=function(){ this.ajax=this.get(); } Ajax.creat.prototype={ get:function(){ try{return new XMLHttpRequest();}catch(e){} try{return new ActiveXObject(‘Msxml2.XMLHTTP.6.0‘);}catch(e){} try{return new ActiveXObject(‘Msxml2.XMLHTTP.4.0‘);}catch(e){} try{return new ActiveXObject(‘Msxml2.XMLHTTP.3.0‘);}catch(e){} try{return new ActiveXObject(‘Msxml2.XMLHTTP‘);}catch(e){} try{return new ActiveXObject(‘MSXML3.XMLHTTP‘);}catch(e){} try{return new ActiveXObject(‘MSXML.XMLHTTP‘);}catch(e){} try{return new ActiveXObject(‘Microsoft.XMLHTTP‘);}catch(e){} try{return new ActiveXObject(‘MSXML2.ServerXMLHTTP‘);}catch(e){} return null; }, request:function(obj){ var self=this,ajax=self.ajax; if(typeof(obj)!=="object"||ajax==null) return; var url=obj.url, type=obj.type||"GET", data=obj.data||null, async=typeof(obj.async)=="boolean"? obj.async : true, success=obj.success||new Function(), error=obj.error||new Function(); if(typeof(data)=="object") data=self.objectToStr(data); if(type=="GET"&&data) url+= (url.indexOf("?")==-1?"?":"&")+data; ajax.open(type,url,async); if(type=="POST") ajax.setRequestHeader("Content-type","application/x-www-form-urlencoded;"); ajax.send(data); ajax.onreadystatechange=function(){ self.handle(ajax,success,error); } return ajax; }, objectToStr:function(s){ var str=""; for(var x in s){ str+= x+"="+s[x]+"&"; } str=str.substring(0,str.lastIndexOf("&")); return str; }, handle:function(xhr,success,error){ if(xhr.readyState==4){ var status=xhr.status; if(status>=200&&status<=300) success(xhr); else error(xhr); }else{} } } root.ajax={request:Ajax.request} })(window) //url,type,data,async,success,error </script> </body> </html>
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原文地址：http://www.cnblogs.com/anson0415/p/4245932.html
