第一种
第二种
如何使元素上下margin不折叠呢？
1.浮动元素、inline-block 元素、绝对定位元素的 margin 不会和垂直方向上其他元素的 margin 折叠 （注意这里指的是上下相邻的元素）
2.创建了块级格式化上下文的元素，不和它的子元素发生 margin 折叠
第二种方法：把这两个
需 要建立 BFC 的不是这两个 触发block formatting context即可，触发的方法：
1. float不为none
2. overflow不为visible
3. display设为‘table-cell’, ‘table-caption’, 或‘inline-block’
4. position既不是static也不是relative
5. zoom:1, IE的hasLayout特性会建立一个新的block formatting context
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