Dropdown组件嵌套使用trigger

[lesliele]

嵌套使用时trigger都是click,子级先出现后消失

     <Dropdown trigger="click"> //父级click
        <a href="javascript:void(0)">
            北京小吃
            <Icon type="ios-arrow-down"></Icon>
        </a>
        <DropdownMenu slot="list">
            <DropdownItem>驴打滚</DropdownItem>
            <DropdownItem>炸酱面</DropdownItem>
            <DropdownItem>豆汁儿</DropdownItem>
            <Dropdown placement="right-start" trigger="click"> //子级click
                <DropdownItem>
                    北京烤鸭
                    <Icon type="ios-arrow-forward"></Icon>
                </DropdownItem>
                <DropdownMenu slot="list">
                    <DropdownItem>挂炉烤鸭</DropdownItem>
                    <DropdownItem>焖炉烤鸭</DropdownItem>
                </DropdownMenu>
            </Dropdown>
            <DropdownItem>冰糖葫芦</DropdownItem>
        </DropdownMenu>
    </Dropdown>