javascript - simple PHP AJAX : How to call a php script -


I'm trying to get my javascript function to use AJAX to call a php script. The PHP script will update the MySQL table but I have tested the PHP script and it works fine.

This is my job: 

  function rate () {$ Ajax ({data: ', url:' update.php ', method:' GET ', success : Function (msg) {alert (msg);}}); }   
 And the function is said later together:  
  rate ();   
 The php script is not required for any information, it should be called only, no one can tell where I am wrong.   
 
 
 Just use this example:  
  & lt; Script & gt; Function rate () {$ .get ("update.php"); } & Lt; / Script & gt;

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