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之前在div中设置了position:fixed后又设置了display:flex，发现flex并不能生效
position:fixed
display:flex
flex
解决方法：在需要进行flex 布局的div外面再套一层div，在外层的div设置position:fixed
div
与 Dian 的连接断开，我们正在尝试重连，请耐心等待