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ajax responseText

<html><head><script type="text/javascript">function loadXMLDoc(){var xmlhttp;if (window.XMLHttpRequest)  {// code for IE7+, Firefox, Chrome, Opera, Safari  xmlhttp=new XMLHttpRequest();  }else  {// code for IE6, IE5  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/test1.txt.htm"/*tpa=http://www.w3school.com.cn/ajax/test1.txt*/,true);xmlhttp.send();}</script></head><body><div id="myDiv"><h2>Let AJAX change this text</h2></div><button type="button" onclick="loadXMLDoc()">通过 AJAX 改变内容</button></body></html>