css flex布局多列，两端对齐，justify-content: space-between;换行往左靠拢有效解决办法

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.list {

    display: flex;

    flex-flow: row wrap;

    justify-content: space-between;

    width: 689px;

    margin: 20px auto 0;

}

.list li {
    width: 140px;
    max-height: 204px;
    padding-bottom: 30px;
}
　　

只需要在后面多加（每一列n个 n-2个）子元素，不设置高度或者后面加的子元素不设置高度，不然会出现空白