CSS全屏布局的5种方式

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【2】float + absolute + (fix)

通过增加结构来提高兼容性，.middle元素设置100%的高度，.top和.bottom设置absolute覆盖在.middle上

    
        
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思路二: inline-block

【1】inline-block + calc

    
        
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【2】inline-block + absolute + (fix)

    
        
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思路三: table

　　水平方向子元素的间距可以用border实现。所有浏览器都不支持给table-cell元素设置overflow属性。firefox和IE11浏览器不支持给table-cell元素的设置100%高度的子元素设置overflow属性

    
        
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思路四: absolute

    
        
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思路五: flex

flex常用于小范围的布局，使用全屏布局时会因为性能问题，出现卡顿现象。如果要使用全屏自适应布局，则只有flex才能达到效果

    
        
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