微信小程序中設置了flex-direction之後，水平居中跟垂直居中的設置反過來了

原創 mini_1251861209 2020-06-30 23:52

設置flex-direction: column;之後，盒子中的元素以列的方式排列，這個時候，跟行排列中，主軸的位置會互換，橫軸會變成豎軸，豎軸會變成橫軸，所以這個時候設置水平居中其實是行排列時的垂直居中即：align-items: center;會使元素水平居中，而行排列中的水平居中justify-content: center;則會使元素垂直居中

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