display:flex屬性 justify-content: space-between換行后的排版問題

<style>
.wrap {
	width: 400px;
	display:flex;  /*彈性盒子*/
	justify-content: space-between;  /*兩端對齊，子元素之間有間隙*/
	flex-flow: row wrap;/*子元素溢出父容器時換行*/
}
span {width: 100px;background-color: green;color:#fff;border-radius: 5px;margin-top: 10px;padding: 10px;}
</style>

<div class="wrap">
	<span>11</span>
	<span>22</span>
	<span>33</span>
	<span>44</span>
	<span>55</span>
</div>

　

 

解決方法：追加一個空的子元素

.wrap:after {content: ""; width: 120px; }