fix menu bug

examples/docs/zh-CN/menu.md

@@ -190,7 +190,7 @@
   <el-radio-button :label="false">展开</el-radio-button>
   <el-radio-button :label="true">收起</el-radio-button>
 </el-radio-group>
-<el-menu default-active="2" class="el-menu-vertical-demo" @open="handleOpen" @close="handleClose" :collapse="isCollapse">
+<el-menu default-active="1-4-1" class="el-menu-vertical-demo" @open="handleOpen" @close="handleClose" :collapse="isCollapse">
   <el-submenu index="1">
     <template slot="title">
       <i class="el-icon-message"></i>

packages/menu/src/menu.vue

@@ -192,7 +192,7 @@
       initOpenedMenu() {
         const index = this.activedIndex;
         const activeItem = this.items[index];
-        if (!activeItem || this.mode === 'horizontal') return;
+        if (!activeItem || this.mode === 'horizontal' || this.collapse) return;
 
         let indexPath = activeItem.indexPath;