日期:2014-05-16  浏览次数:20354 次

xmlhttp简单的很就是不知道错在哪里,,帮我看看
<!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 ">
<head>
<meta   http-equiv= "Content-Type "   content= "text/html;   charset=gb2312 "   />
<title> 无标题文档 </title>
</head>
<script   language= "javascript ">

function   createxmlhttprequest(){
var   xmlhttp;
if(window.ActiveXObject){
xmlhttp=new   ActiveXObject( "Microsoft.XMLHTTP ")
}else   if(window.XMLHttpRequest){
xmlhttp=new   XMLHttpRequest();
}
}
function   startrequest(){
createxmlhttprequest();
xmlhttp.onreadystatechange=callback;
xmlhttp.open( "get ", "gadget.xml ",true)
xmlhttp.send();
}
function   callback(){

if(xmlhttp.readyState==4){
if(xmlhttp.status==200){
var   bob=xmlhttp.responseText;
alert( "返回的信息为: "+bob)
}}}
</script>
<body>
<form>
<input   name= "clickde "   type= "button "   onclick= "return   startrequest(); "   value= "提交 ">
</form>
</body>
</html>

------解决方案--------------------
<script language= "javascript ">
var xmlhttp;
function createxmlhttprequest(){

if(window.ActiveXObject){
xmlhttp=new ActiveXObject( "Microsoft.XMLHTTP ")
}else if(window.XMLHttpRequest){
xmlhttp=new XMLHttpRequest();
}
}


把 xmlhttp 定义放到 function 外面.

放着 jquery 这样好的类库不用.非要自己去写这些呢??

为什么????