现在的下拉菜单是兼容性越来越好了，不用js的最好了，但如果能用最少的代码实现出效果，也是不错的
第一个，用到的js,不过很短，也很明了
下挂菜单 万水千山 万种风情 万山千水 万马奔腾
[ctrl+a 全选 注:如需引入外部js需刷新才能执行]
这一个也不错
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