在使用justify-content: space-between;时,经常会遇到下列问题,

		ul {width: 500px;height: 500px;display: flex;justify-content: space-between;flex-wrap: wrap;}li {width: 130px;list-style: none;background-color: pink;height: 30px;margin: 20px 0;}ul:last-child::after{content: '';width: 130px;height: 30px;}