added scrolling property to toggle CSS for creating or hiding scrollbars

test/routers/more.vue

@@ -5,21 +5,26 @@
 </style>
 <template>
     <i-button type="primary" @click="modal1 = true">显示对话框</i-button>
+    <i-button @click="scrolling = !scrolling">Toggle Scrolling</i-button>
+    Scrolling:{{scrolling}}
     <Modal
             :visible.sync="modal1"
             title="普通的Modal对话框标题"
+            :scrolling="scrolling"
             @on-ok="ok"
             @on-cancel="cancel">
         <p>对话框内容</p>
         <p>对话框内容</p>
         <p>对话框内容</p>
+        <i-button @click="scrolling = !scrolling">Toggle Scrolling</i-button>
     </Modal>
 </template>
 <script>
     export default {
         data () {
             return {
-                modal1: false
+                modal1: false,
+                scrolling: false
             }
         },
         methods: {