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CSS3模拟动画下拉菜单效果
下拉菜单模拟效果图：CSS3：<style>#box{width:200px; height:50px; overflow:hidden; cursor: pointer; transition: all 0.35s;}#box
下拉菜单模拟效果图：CSS3：<style>#box{width:200px; height:50px; overflow:hidden; cursor: pointer; transition: all 0.35s;}#box
