main要首先加载就必须写在第一位,但因为left需要显示在最左侧,所以需要设置left的order为-1
flex属性的完整写法是:flex: flex-grow flex-shrink flex-basis 。
这也是flex实现三栏布局的核心,main设置flex-grow为1,说明多余空间全部给main,而空间不够时,仅缩小left right部分,
同时因为指定了left right部分的flex-basis,所以指定了两者的宽度,保证其显示效果
<style type="text/css">
.container {
display: flex;
flex-direction: row;
}
.main {
height: 200px;
background-color: red;
flex-grow: 1;
}
.left {
height: 200px;
order: -1;
margin-right: 20px;
background-color: yellow;
flex: 0 1 200px;
}
.right {
height: 200px;
margin-left: 20px;
background-color: green;
flex: 0 1 200px;
}
</style>
</head>
<body>
<div class="container">
<div class="main">fsdfjksdjflkasjdkfjsdkljfklsjadfkljaksdljfskljffjksldfjldsfdskjflsdjfkljsdlfjsldjfklsjdkflj</div>
<div class="left"></div>
<div class="right"></div>
</div>
</body>