fix docs

components/collapse/demo/basic.md

@@ -11,7 +11,7 @@ More than one panel can be expanded at a time, the first panel is initialized to
 ```html
 <template>
   <div>
-    <a-collapse v-model="activeKey" @change="changeActivekey">
+    <a-collapse v-model="activeKey">
       <a-collapse-panel header="This is panel header 1" key="1">
         <p>{{text}}</p>
       </a-collapse-panel>
@@ -32,10 +32,10 @@ More than one panel can be expanded at a time, the first panel is initialized to
         activeKey: ['1']
       }
     },
-    methods: {
-      changeActivekey (key) {
+    watch: {
+      activeKey(key){
         console.log(key)
-      },
+      }
     },
   }
 </script>

components/collapse/index.en-US.md

@@ -4,9 +4,13 @@
 
 | Property | Description | Type | Default |
 | -------- | ----------- | ---- | ------- |
-| activeKey | Key of the active panel | string\[]\|string | No default value. In `accordion` mode, it's the key of the first panel. |
+| activeKey(v-model) | Key of the active panel | string\[]\|string | No default value. In `accordion` mode, it's the key of the first panel. |
 | defaultActiveKey | Key of the initial active panel | string | - |
-| change | Callback function executed when active panel is changed | Function | - |
+
+### events
+| Events Name | Description | Arguments |
+| --- | --- | --- |
+| change | Callback function executed when active panel is changed  | function(key) |
 
 ### Collapse.Panel
 

components/collapse/index.zh-CN.md

@@ -4,9 +4,13 @@
 
 | 参数 | 说明 | 类型 | 默认值 |
 | --- | --- | --- | --- |
-| activeKey | 当前激活 tab 面板的 key | string\[]\|string | 默认无，accordion模式下默认第一个元素 |
+| activeKey(v-model) | 当前激活 tab 面板的 key | string\[]\|string | 默认无，accordion模式下默认第一个元素 |
 | defaultActiveKey | 初始化选中面板的 key | string | 无 |
-| change | 切换面板的回调 | Function | 无 |
+
+### 事件
+| 事件名称 | 说明 | 回调参数 |
+| --- | --- | --- |
+| change | 切换面板的回调 | function(key) |
 
 ### Collapse.Panel