内部邮件 切换分类bug

Learun.Framework.Ultimate V7/Learun.Application.Web/Areas/EducationalAdministration/Views/LanMail/Index.js

@@ -296,7 +296,7 @@ var bootstrap = function ($, learun) {
                 var $parent = $this.parent();
                 $parent.find('.active').removeClass('active');
                 $this.addClass('active');
-                var data_value = $this.context.dataset.value;
+                var data_value = $this[0].dataset.value;
                 switch (data_value) {
                     case "1"://写邮件
                         $("#lr_edit").hide();