PHP + JQuery + Ajax user registration verification

This afternoon I studied jquery and made a simple user name check program to check whether the current user name already exists. Contains 4 files: jquery-1.4.jscheck.jscheck.htmlcheck.php

This afternoon I studied jquery and made a simple user name check program to check whether the current user name already exists.
Contains 4 files: jquery-1.4.js check. js check.html check. php
Where the jquery-1.4.js is JQuery code, you can download Oh. Check. js is a self-written file for verification.

The code is as follows:

 
 

  
  
// Check. js
  
  
$ (Document). ready (function (){
  
  
$ ("# Username"). blur (function (){
  
  
Var username = $ (this). val ();
  
  
Var url = "check. php ";
  
  
$. Post (url, {name: username}, function (str ){
  
  
If (str = '1 '){
  
  
$ ("# Info" ).html ("registered ");
  
  
} Else {
  
  
$ ("# Info" ).html ("registered ");
  
  
}
  
  
});
  
  
});
  
  
});
 
 

 
 

  
  
// Check. php
  
  
 // Tianya PHP blog http://blog.phpha.com
  
  
If (isset ($ _ POST ['name']) {
  
  
$ Username = trim ($ _ POST ['name']);
  
  
// Test only (database not queried). assume that the user name admin is registered.
  
  
If ($ username = 'admin '){
  
  
Exit ('1 ');
  
  
}
  
  
Exit ('0 ');
  
  
}
  
  
?>
 
 

 
 

  
  
// Check.html
  
  

  
  

  
  
 Script