AJAX detect entered username without refreshing

This time I will bring you AJAX to detect the entered user name without refreshing. What are the precautions for AJAX to detect the entered user name without refreshing? The following is a practical case. Let’s take a look.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:

# I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!

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