Ajax 基本操作步骤

<mce:script language="javascript"><!-- function $(id){ return document.getElementById(id); } //-------------------------start-------------------------------------- var xmlHttp=null; function createXMLHttpRequest(){ if(Window.ActiveXObject){ xmlHttp=new ActiveXObject("Microsoft.XMLHTTP"); }else if(Window.XMLHttpRequest){ xmlHttp=new XMLHttpRequest(); }else{ alert("NOT Support XMLHttpRequest"); } } function ajaxDeal(){ createXMLHttpRequest(); var url="user.php?u_id=6"; xmlHttp.onreadystatechange=handleResponse; xmlHttp.open("GET",url,true); xmlHttp.send(null); } function handleResponse(){ if(xmlHttp.readyState==4){ if(xmlHttp.status==200){ var responseText=xmlHttp.responseText; //do something $("content").innerHTML=responseText; } } } //-----------------------end------------------------------------------ // --></mce:script> //html <input type="button" value="Test" onclick="ajaxDeal()"/> <div id="content"> </div>