[element] el-menu 收起展开的子菜单

<el-menu
    :default-openeds="defaultOpenedsArray"
    unique-opened 
    mode="vertical"
    :collapse-transition="false"
    @select="handleSelectMenu"
>
el-menu>
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defaultOpenedsArray:[]
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 handleSelectMenu(index) {
      if (index || index != null) {
        // 收起展开的子菜单
        this.defaultOpenedsArray = [];
      }
    },
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