ajax基础框架

gundumw100

<script type="text/javascript">var xmlhttp;function loadXMLDoc(url){xmlhttp=null;if (window.XMLHttpRequest){// code for all new browsers  xmlhttp=new XMLHttpRequest();}else if (window.ActiveXObject){// IE5 and IE6  xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");} xmlhttp.onreadystatechange=stateChange;  xmlhttp.open("GET",url,true);//true表示继续执行后面的代码send()，而不必等待服务器的响应  xmlhttp.send(null); }function stateChange(){if (xmlhttp.readyState==4){// 4 = "loaded"  if (xmlhttp.status==200){// 200 = OK    // 这里添加需要怎么处理的代码!   }else{    alert("出错啦！");   }  }}</script>