Ajax数据未加载

I am trying to code a simple customer mobile page. On the first page, i have names of each customer. onclick of one of them, it's open this file contain code below, however no data is loading. But if I try the refresh page, it works!

<script type='text/javascript' language='javascript'>
window.onload=function()
{

   url = 'http://whateverorigin.org/get?url=' + 
   encodeURIComponent('http://www.mydomain.com/myphpfile.php') + '&callback=?';
   $.ajax({
      url: url,
      dataType: 'json',
      timeout: 4000,
      success: function(reponse){
      a=reponse.contents.split(';'); 
      document.getElementById("client").innerHTML = a[0] ;
      document.getElementById("adresse1").innerHTML = a[1] ;
},

});

}

</script>

First off you dont need to include the '&callback=?'; param as jQuery will handle that automatically as long as you have dataType: 'JSONP'

$(document).ready(function(){
    var encoded = encodeURIComponent('http://www.mydomain.com/myphpfile.php');

    $.ajax({
      url: 'http://whateverorigin.org/get?url='+encoded,
      dataType: 'jsonp',
      timeout: 4000
    }).done(function(reponse){
        //do your work 
    })
})