ajax

<?php
$.post(
    "__url__/sign_up",
    {name: name},
     function(data) {
     console.log(data);
      if(data['state'] == 400) {
            $('#username_success a').text(data.msg);
            $('#username_success img').css('display','none');
        } else {
            $('#username_success a').text('');
             $('#username_success img').css('display','block');    
         }
      }
      ?>