dropdown docs improve

examples/docs/en-US/dropdown.md

@@ -104,6 +104,29 @@ Click the triggering element or hover on it.
 </el-row>
 ```
 :::
+
+### Menu hiding behavior
+
+Use `hide-on-click` to define if menu closes on clicking.
+
+:::demo By default menu will close when you click on menu items, and it can be turned off by setting hide-on-click to false.
+```html
+<el-dropdown :hide-on-click="false">
+  <span class="el-dropdown-link">
+    Dropdown List<i class="el-icon-caret-bottom el-icon--right"></i>
+  </span>
+  <el-dropdown-menu slot="dropdown">
+    <el-dropdown-item>Action 1</el-dropdown-item>
+    <el-dropdown-item>Action 2</el-dropdown-item>
+    <el-dropdown-item>Action 3</el-dropdown-item>
+    <el-dropdown-item disabled>Action 4</el-dropdown-item>
+    <el-dropdown-item divided>Action 5</el-dropdown-item>
+  </el-dropdown-menu>
+</el-dropdown>
+```
+:::
+
+
 ### Dropdown Attributes
 | Attribute      | Description          | Type      | Accepted Values       | Default  |
 |-------------  |---------------- |---------------- |---------------------- |-------- |

examples/docs/zh-CN/dropdown.md

@@ -147,6 +147,27 @@
 ```
 :::
 
+### 菜单隐藏方式
+
+可以`hide-on-click`属性来配置。
+
+:::demo 下拉菜单默认在点击菜单项后会被隐藏，将`hide-on-click`属性默认为`false`可以关闭此功能。
+```html
+<el-dropdown :hide-on-click="false">
+  <span class="el-dropdown-link">
+    下拉菜单<i class="el-icon-caret-bottom el-icon--right"></i>
+  </span>
+  <el-dropdown-menu slot="dropdown">
+    <el-dropdown-item>黄金糕</el-dropdown-item>
+    <el-dropdown-item>狮子头</el-dropdown-item>
+    <el-dropdown-item>螺蛳粉</el-dropdown-item>
+    <el-dropdown-item disabled>双皮奶</el-dropdown-item>
+    <el-dropdown-item divided>蚵仔煎</el-dropdown-item>
+  </el-dropdown-menu>
+</el-dropdown>
+```
+:::
+
 
 ### Dropdown Attributes
 | 参数          | 说明            | 类型            | 可选值                 | 默认值   |