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Ajax 无刷新在注册用户名时的应用的代码

2024-07-03 09:01:58   218人阅读

var xmlHttp;  
uName() //用户名失去焦点时  
{  
 if(all.uname.=="")  
 {  
  all.l1.innerHTML="不能为空！";  
  setTimeout("close(1)",1500);  
  return;  
 }  
 else  
 {  
  xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");  
  xmlHttp.onreadystatechange=deal; //回调函数  
  var url="aJax.aspx?user=‘"+all.uname.+"‘"; //将要跳转到检测用户名的页面  
  xmlHttp.open("get",url,true); //用 get 模式提交表单 到 url ；并启动 一步处理  
  xmlHttp.send(null); //发送  
 }  
}  
deal()  
{  
 //alert(xmlHttp.readystate+"__"+xmlHttp.status);  
 if(xmlHttp.readystate!=4)  
 {return; }  

 if(xmlHttp.status!=200)  //等于500 时是 sql 语句或数据库的错误  
 {return;}  
 //  

 var num = xmlHttp.responseText; //接收服务器发送的信息  
 //alert(num);  
 all.l1.innerText="";  
 if(num>0)  
 {  
  all.l1.innerText="次用户名已被使用！";  
 }  
 else   
 {  
  all.l1.innerText="√";  
 }  

}

 

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