ajax.js
function loadXMLDoc() {
var xmlhttp;
if (window.XMLHttpRequest){
xmlhttp=new XMLHttpRequest();
}
else {
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=function () {
if(xmlhttp.readyState==4 && xmlhttp.status==200){
document.getElementById("mydiv").innerHTML=xmlhttp.responseText;
}
}
xmlhttp.open("GET","aaa.txt",true);
xmlhttp.send();
}
ajax.html
<head>
<meta charset="UTF-8">
<title>Title</title>
<script src="js/ajax.js"></script>
</head>
<body>
<div id="mydiv"><h1>使用ajax修改文本内容</h1></div>
<button type="button" id="btn1" onclick="loadXMLDoc()">修改内容</button>
</body>