$（window）.load（）里面有ajax

Question

I'm trying to retrieve all the data inside the database when the page is loaded but when I try to click the refresh button nothing was returned, do you have any idea why? Here is my code:

      $(window).load(function (){
        $.ajax({                
            url: 'get.php',
            dataType: 'json',
            success: function (data){
               $.each(data, function(i,item) {
                 $('#info').append("<p> you are:"+data[i].username+"</p> <p> your  message  is:"+data[i].msg);
               })
             }
        });


      });

Answer 1

New answer posted here.

Change your php code as below

if(isset($_POST['username']) && isset($_POST['msg'])){
  $username = $_POST['username'];

  $msg = $_POST['msg'];
}