用过Qt的QHBoxLayout，QVBoxLayout再看flex布局有很多相似之处，特别要注意的是flex属性是flex-grow, flex-shrink 和 flex-basis的简写，默认值为0 1 auto，后面两个是可以省略的。当一个容器没有显示出来时要注意它应该设置宽高或者flex值是不是大于0。
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style type="text/css">
body {
display: flex;
flex-direction: row;
background-color: rgb(255, 255, 255);
justify-content: center;
}
.main {
display: flex;
flex-direction: column;
background-color: rgb(15, 15, 16);
width: 760px;
height: 600px;
border: 1px solid rgb(14, 148, 150);
-webkit-border-radius: 5px 5px 0px 0px;
border-radius:5px 5px 0px 0px;
}
.title {
display: inline-flex;
height: 40px;
background-color: rgb(14, 148, 150);
color: rgb(255, 255, 255);
align-items: center;
padding-left: 20px;
}
.content {
display: flex;
flex-direction: row;
flex: 1;
}
.left {
border-right: 1px solid rgb(60, 60, 65);
background-color: rgb(20, 20, 21);
width: 200px;
}
.left .search {
display: flex;
}
.left .searchInput {
flex: 1;
height: 38px;
background-color: rgb(15, 15, 16);
font-size: 14px;
border: none;
border-bottom: 1px solid rgb(46, 46, 51);
color: rgb(255, 255, 255);
padding-left: 5px;
padding-right: 5px;
}
.right {
display: flex;
flex: 1;
flex-direction: column;
}
.right .profile {
flex: 1;
background-color: rgb(30, 30, 33);
border-bottom: 1px solid rgb(69, 69, 75);
}
.right .chat {
flex: 7;
background-color: rgb(20, 20, 21);
}
.right .input {
flex: 2;
background-color: rgb(15, 15, 16);
border-top: 1px solid rgb(50, 52, 56);
}
</style>
</head>
<body>
<div class="main">
<div class="title">
Flex Layout Test
</div>
<div class="content">
<div class="left">
<div class="search">
<input class="searchInput" type="text">
</div>
<div class="list">
</div>
</div>
<div class="right">
<div class="profile">
</div>
<div class="chat">
</div>
<div class="input">
</div>
</div>
</div>
</div>
</body>
</html>
效果图
