日期:2014-05-16 浏览次数:20698 次
<html>
<head>
<title>createAjax.html</title>
</head>
<body>
<script language="Javascript">
var xmlHttp;
function createXMLHttp(){
if(window.XMLHttpRequest){
xmlHttp=new XMLHttpRequest();
}else{
xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
}
}
function showMsg(){
xmlHttp.open("POST","content.html");
xmlHttp.onreadystatechange=showMsgCallback();
xmlHttp.send(null);
}
function showMsgCallback(){
if(xmlHttp.readyState == 4){
if(xmlHttp.status == 200){
var text=xmlHttp.responseText;
document.getElementById("msg").className="样式表名称";
document.getElementById("msg").innerHTML=text;
}
}
}
</script>
<input type="button" onclick="showMsg()" value="调用AJAX显示内容"/>
<span id="msg"></span>
</body>
</html>
hello world!!!
function showMsg(){
xmlHttp.open("POST","content.html");
//xmlHttp.onreadystatechange=showMsgCallback();
xmlHttp.onreadystatechange=showMsgCallback;//这句才是正确的写法,去掉了showMsgCallback后的括号
xmlHttp.send(null);
}
------解决方案--------------------
除了楼上各位的建议,楼主可以看看你的createXMLHttp()好像就没用到,这应该是个失误吧