optimize Input shaking when it init

optimize Input shaking when it init

src/components/cascader/cascader.vue

@@ -1,18 +1,81 @@
 <template>
-    
+    <div :class="[prefixCls]">
+        <i-input
+            readonly
+            :disabled="disabled"
+            :value.sync="displayRender"
+            :size="size"
+            :placeholder="placeholder"></i-input>
+    </div>
 </template>
 <script>
+    import iInput from '../input/input.vue';
+    import Dropdown from '../select/dropdown.vue';
+    import clickoutside from '../../directives/clickoutside';
+    import { oneOf, MutationObserver } from '../../utils/assist';
+
+    const prefixCls = 'ivu-cascader';
+
     export default {
         props: {
-        
+            data: {
+                type: Array,
+                default () {
+                    return []
+                }
+            },
+            value: {
+                type: Array
+            },
+            disabled: {
+                type: Boolean,
+                default: false
+            },
+            clearable: {
+                type: Boolean,
+                default: false
+            },
+            placeholder: {
+                type: String,
+                default: '请选择'
+            },
+            size: {
+                validator (value) {
+                    return oneOf(value, ['small', 'large']);
+                }
+            },
+            trigger: {
+                validator (value) {
+                    return oneOf(value, ['click', 'hover']);
+                },
+                default: 'click'
+            },
+            changeOnSelect: {
+                type: Boolean,
+                default: false
+            },
+            renderFormat: {
+                type: Function,
+                default: (label, selectedData) => {
+                    label.join('/');
+                }
+            }
         },
         data () {
             return {
-            
+                prefixCls: prefixCls,
+                selected: []
             }
         },
         computed: {
-        
+            displayRender () {
+                let label = [];
+                for (let i = 0; i < this.selected.length; i++) {
+                    label.push(this.selected[i].label);
+                }
+
+                return this.renderFormat(label);
+            }
         },
         methods: {