AJAX implements the function of detecting user names without refreshing

This article mainly introduces the AJAX non-refresh user name detection function in detail, which has certain reference value. Interested friends can refer to it

Let’s take a look at the schematic diagram first

register.php

 
  
  
  
 

 
  

   
   

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registerPro1.php

网名不可用";
// }else{
//  $info.="网名可用";
// }
// echo $info;
 //③
// $info="";
// if($username=="abc"){
//  //这里的$info返回的是一个字串
//  $info.='{"res":"不可用","id":"123","age":"5"}';
// }else{
//  $info.='{"res":"可用","id":"3","age":"1"}';
// }
// echo $info;
 //③+
 $info="";
 if($username=="abc"){
  //这里的$info返回的是一个字串
  $info.='[{"res":"不可用","id":"123","age":"5"},{"res":"abc不可用","id":"3","age":"0"}]';
 }else{
  $info.='[{"res":"可用","id":"1","age":"15"},{"res":"可用","id":"83","age":"9"}]';
 }
 echo $info;
?>

Rendering:

The above is what I compiled for everyone. I hope it will be helpful to everyone in the future.

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