修复title不显示的问题

Author: keepfool

02.Components/Part-2/demo/step02.html

@@ -87,7 +87,8 @@ <h1 class="dialog-title">{{ title }}</h1>
 				data: function() {
 					return {
 						mode: 0,
-						item: {}
+						item: {},
+						title: ''
 					}
 				},
 				props: ['dataList', 'columns', 'searchKey'],