在MVC3 中使用jquery ajax 返回的是Json數據類型，那么在前臺如何獲取該返回的Json數據呢？？JS代碼如下：<script type="text/javascript">     $(function () {         $("#login").bind("click", function () {             $.ajax({                 type: "POST",                 dataType: "JSON",                 contentType: "application/JSON",                 url: "./Index",                 beforeSend: function () {                 },                 success: function (data) {                    var obj = eval(data);                     alert(data.success);                 }             });         });     });</script>