`

javascript写ajax代码

AjaxJavaScriptChromeSafariFirefox 
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<%@ page language="java" contentType="text/html;charset=UTF-8"
pageEncoding="UTF-8"%>
<html>
<head>
<title>Ajax一</title>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8">
<script type="text/javascript">
function sub(){
var xmlhttp;
if (window.XMLHttpRequest)
  {// code for IE7+, Firefox, Chrome, Opera, Safari
alert("1111");
  xmlhttp=new XMLHttpRequest();
  }
else
  {// code for IE6, IE5
  xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
  }
xmlhttp.onreadystatechange=function()
  {
  if (xmlhttp.readyState==4 && xmlhttp.status==200)
    {
  alert("222");
  document.getElementById("result").innerHTML=xmlhttp.responseText;
    }
  }
var url="HelloServlet?user="+document.getElementById("user").value+"&date="+new Date();
xmlhttp.open("GET",url,true);
xmlhttp.send();
}
</script>
</head>
<body style="text-align: center;">
<form>
<input id="user" type="text" name="user"/>
<button onclick="sub()">提交</button>
</form>
<div id="result"></div>
</body>
</html>



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