javascript中AJAX用法实例分析

var xhr = null; if(window.XMLHttpRequest){ //非IE浏览器   xhr = window.XMLHttpRequest; }else if(window.ActiveXObject){ //IE浏览器   try{   //高版本，受msxml3.dll+支持     xhr = new ActiveXObject("Msxml2.XMLHTTP");   }catch(e){     try{  // 低版本，msxml2.6以下版本使用      xhr = new ActiveXObject("Microsoft.XMLHTTP");     }catch(e){      alert("IE浏览器无法创建ActiveXObject对象！");     }   } }

xhr.open("POST",url,true); xhr.setRequestHeader("Content-Type","application/x-www-form-urlencoded"); xhr.onreadystatechange=stateChangeHandler; xhr.send(); //var name="clf"; xhr.send(name); function stateChangeHandler(){   if(xhr.readystate==4&&xhr.status==200){    var obj = document.getElementById("targetDiv");   obj.innerHTML = xhr.responseText;   } }