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Ajax asynchronously requests the mouse to leave the input text box problem

一个新手Original: 2017-09-20 09:24:422178browse

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>ajax1</title> 
<script>
//创建浏览器对象
function createXhr(){
 //判定浏览器类型处理第一种方法 
/*  var xhr;
 var str=window.navigator.userAgent;
 if(str.indexOf(&#39;MSIE&#39;)>0){
	xhr=new ActiveXObject(&#39;Microsoft.XMLHTTP&#39;);
 }else{
	xhr=new XMLHttpRequest();
 }
return xhr;
 */
 try{
	  return new ActiveXObject(&#39;Microsoft.XMLHTTP&#39;);
  }catch(e){
   }
  try{
	  return new XMLHttpRequest();
  }catch(e){
  }
   
};
//获得id属性值简单分装方法
function $(id){
	  return document.getElementById(id);
};
window.onload=function(){
	$(&#39;username&#39;).onblur=function(){
     	var username=$(&#39;username&#39;).value;
           var xhr=createXhr();
           xhr.onreadystatechange=function(){
        	  if(xhr.readyState==4&&xhr.status==200){
                };
           }
   		  xhr.open("get","/ajax2?username="+username);
   	       xhr.send(null);
	} 
 };
</script>
</head>
<body>
用户名:<input type="text" name="username" id="username"/> 
</body>
</html>

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