<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <script> function loadXMLDoc(){ var xmlhttp; if (window.XMLHttpRequest){ // IE7+, Firefox, Chrome, Opera, Safari 浏览器执行代码 xmlhttp=new XMLHttpRequest(); }else{ // IE6, IE5 浏览器执行代码 xmlhttp=new ActiveXObject("Microsoft.XMLHTTP"); } xmlhttp.onreadystatechange=function(){ if (xmlhttp.readyState==4 && xmlhttp.status==200) { document.getElementById("myDiv").innerHTML=xmlhttp.responseText; } } xmlhttp.open("GET","ajax.txt",true); //这里填写请求路径 xmlhttp.send(); } </script> </head> <body> <div id="myDiv"><h2></h2></div> <button type="button" onclick="loadXMLDoc()">显示内容</button> </body> </html>