<!DOCTYPE HTML>
<html>
<head>
  <title>Untitled</title>
  <meta charset="utf-8">
  <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
  <script>
   $(function ()
{
    var s = $('input[data-send]').data('send');
    alert(s.param)
})
  </script>
</head>
<body>
<input type="text" name="url" data-send='{"url":"124","method":"POST","param":"44214"}'>
</body>
</html>