<html>
<head>
<style>
#main {
width: 140px;
height: 300px;
border: 1px solid #000000;
display: flex;
flex-flow: row wrap;
align-content: space-around;
}
#main div {
width: 70px;
height: 70px;
}
</style>
</head>
<body>
<div id="main">
<div style="background-color:coral;"></div>
<div style="background-color:lightblue;"></div>
<div style="background-color:khaki;"></div>
<div style="background-color:pink;"></div>
<div style="background-color:lightgrey;"></div>
<div style="background-color:lightgreen;"></div>
</div>
<p>点击“尝试一下”按钮，设置 alignContent 属性的值为 "space-between"。</p>
<button onclick="myFunction()">尝试一下</button>
<script>
function myFunction()
{
document.getElementById("main").style.alignContent = "space-between";
}
</script>
<p><b>注意：</b>Internet Explorer、Firefox 和 Safari 不支持 alignContent 属性。</p>
</body>
</html>