您不应设置任何大小。您可以使用额外的元素或带有％的垂直填充的伪元素。这将允许您使用width作为参考：显示以下内容的代码段：
.flex-container {
padding: 0;
margin: 0;
list-style: none;
display: -webkit-@R_761_2419@;
display: -moz-@R_761_2419@;
display: -ms-flex@R_761_2419@;
display: -webkit-flex;
display: flex;
-webkit-flex-flow: row;
justify-content: space-around;
line-height:30px;
}
.flex-item {
background: tomato;
margin: 5px;
color: white;
font-weight: bold;
font-size: 1.5em;
text-align: center;
flex: 1 0 auto;
height:auto;
}
.flex-item:before {
content:'';
float:left;
padding-top:100%;
}
<body>
<div class="flex-container">
<div class="flex-item">1</div>
<div class="flex-item">2</div>
<div class="flex-item">3</div>
<div class="flex-item">4</div>
<div class="flex-item">5</div>
<div class="flex-item">6</div>
<div class="flex-item">7</div>
</div>
<div class="flex-container">
<div class="flex-item">1</div>
<div class="flex-item">2</div>
<div class="flex-item">3</div>
<div class="flex-item">4</div>
<div class="flex-item">5</div>
<div class="flex-item">6</div>
<div class="flex-item">7</div>
</div>
<div class="flex-container">
<div class="flex-item">1</div>
<div class="flex-item">2</div>
<div class="flex-item">3</div>
<div class="flex-item">4</div>
<div class="flex-item">5</div>
<div class="flex-item">6</div>
<div class="flex-item">7</div>
</div>
<div class="flex-container">
<div class="flex-item">1</div>
<div class="flex-item">2</div>
<div class="flex-item">3</div>
<div class="flex-item">4</div>
<div class="flex-item">5</div>
<div class="flex-item">6</div>
<div class="flex-item">7</div>
</div>
<div class="flex-container">
<div class="flex-item">1</div>
<div class="flex-item">2</div>
<div class="flex-item">3</div>
<div class="flex-item">4</div>
<div class="flex-item">5</div>
<div class="flex-item">6</div>
<div class="flex-item">7</div>
</div>
<div class="flex-container">
<div class="flex-item">1</div>
<div class="flex-item">2</div>
<div class="flex-item">3</div>
<div class="flex-item">4</div>
<div class="flex-item">5</div>
<div class="flex-item">6</div>
<div class="flex-item">7</div>
</div>
<div class="flex-container">
<div class="flex-item">1</div>
<div class="flex-item">2</div>
<div class="flex-item">3</div>
<div class="flex-item">4</div>
<div class="flex-item">5</div>
<div class="flex-item">6</div>
<div class="flex-item">7</div>
</div>
</body>
一个inline-block的元素可以做太多，只是适应框的显示/行为和它的内容。这里的魔力来自于填充：50％0;（100％的垂直填充等于父级的宽度）。有关垂直边距和填充，
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