[new feature] DropdownMenu: add close-on-click-overlay prop

packages/dropdown-menu/en-US.md

@@ -83,6 +83,7 @@ export default {
 | active-color | Active color of title and option | `String` | `#1989fa` |
 | z-index | z-index of menu item | `Number` | `10` |
 | overlay | Whether to show overlay | `Boolean` | `true` |
+| close-on-click-overlay | Whether to close when click overlay | `Boolean` | `true` |
 
 ### DropdownItem Props
 

packages/dropdown-menu/index.js

@@ -19,6 +19,10 @@ export default sfc({
     activeColor: {
       type: String,
       default: BLUE
+    },
+    closeOnClickOverlay: {
+      type: Boolean,
+      default: true
     }
   },
 

packages/dropdown-menu/zh-CN.md

@@ -84,7 +84,8 @@ export default {
 |------|------|------|------|------|
 | active-color | 菜单标题和选项的选中态颜色 | `String` | `#1989fa` | - |
 | z-index | 菜单栏 z-index 层级 | `Number` | `10` | - |
-| overlay | 是否显示遮罩层 | `Boolean` | `true` | - | - |
+| overlay | 是否显示遮罩层 | `Boolean` | `true` | - |
+| close-on-click-overlay | 是否在点击蒙层后关闭菜单 | `Boolean` | `true` | - |
 
 ### DropdownItem Props