<html>
<head>
<style>
#main {
width: 350px;
height: 100px;
border: 1px solid #c3c3c3;
display: flex;
}
#main div:nth-of-type(1) {flex-grow: 1;}
#main div:nth-of-type(2) {flex-grow: 1;}
#main div:nth-of-type(3) {flex-grow: 1;}
</style>
</head>
<body>
<div id="main">
<div style="background-color:coral;"></div>
<div style="background-color:lightblue;" id="myBlueDiv"></div>
<div style="background-color:khaki;"></div>
</div>
<p>点击“尝试一下”按钮设置蓝色 div 元素的 flexGrow 属性的值为 "5"。</p>
<button onclick="myFunction()">尝试一下</button>
<script>
function myFunction()
{
document.getElementById("myBlueDiv").style.flexGrow = "5";
}
</script>
<p><b>注意：</b>Internet Explorer 和 Safari 不支持 flexGrow 属性。</p>
</body>
</html>