最近我根据一个UI设计，耗时3h快速实现较复杂页面布局，如上图。根据这份UI设计图，实现代码如下，暂不考虑具体细节，先以成型为主：
<!DOCTYPE html>
<html> <style type="text/css"> *{
padding: 0;
margin: 0;
font-size: 62.5%; } li{
list-style:none
} html{
height:100%;
} body{
height:100%;
} </style> <head>
<title>点餐页</title>
</head>
<body> <header style="width:100%;height:14.28%;background:red"></header>
<div style="width:100%;height:71.42%;display:flex;"> <span style="width:85.72%;overflow-y: auto"> <div style="display: flex;flex-direction:column;height: 50rem"> <span style="width: 100%;height:10%;background:black;margin: 0.5rem 0"></span>
<ul style="width: 100%;background:pink;display: flex;flex-wrap:wrap;justify-content:space-between;"> <li style="width: 30%;height: 20rem;margin: 1rem;display: flex;flex-direction: column">
<span style="background:black ;height: 70%"></span>
<span style="height:10%;background:black;margin: 1rem 0"></span>
<span style="height:15%;background:blue;display: flex;justify-content:space-between;align-items: center;">
<span style="font-size: 2rem">123</span>
<button style="width: 25%">+</button>
</span>
</li>
<li style="width: 30%;height: 20rem;background: black;margin: 1rem"></li>
<li style="width: 30%;height: 20rem;background: black;margin: 1rem"></li>
<li style="width: 30%;height: 20rem;background: black;margin: 1rem"></li>
<li style="width: 30%;height: 20rem;background: black;margin: 1rem"></li>
<li style="width: 30%;height: 20rem;background: black;margin: 1rem"></li> </span> </div>
<div style="display: flex;flex-direction:column;height: 50rem"> <span style="width: 100%;height:10%;background:green;margin: 0.5rem 0"></span>
<ul style="width: 100%;background:pink;display: flex;flex-wrap:wrap;justify-content:space-between;"> <li style="width: 30%;height: 20rem;margin: 1rem;display: flex;flex-direction: column">
<span style="background:black ;height: 70%"></span>
<span style="height:10%;background:black;margin: 1rem 0"></span>
<span style="height:15%;background:blue;display: flex;justify-content:space-between;align-items: center;">
<span style="font-size: 2rem">123</span>
<button style="width: 25%">+</button>
</span>
</li>
<li style="width: 30%;height: 20rem;background: black;margin: 1rem"></li>
<li style="width: 30%;height: 20rem;background: black;margin: 1rem"></li>
<li style="width: 30%;height: 20rem;background: black;margin: 1rem"></li>
<li style="width: 30%;height: 20rem;background: black;margin: 1rem"></li>
<li style="width: 30%;height: 20rem;background: black;margin: 1rem"></li> </ul> </div>
<div style="display: flex;flex-direction:column;height: 50rem"> <span style="width: 100%;height:10%;background:green;margin: 0.5rem 0"></span>
<ul style="width: 100%;background:pink;display: flex;flex-wrap:wrap;justify-content:space-between;"> <li style="width: 30%;height: 20rem;margin: 1rem;display: flex;flex-direction: column">
<span style="background:black ;height: 70%"></span>
<span style="height:10%;background:black;margin: 1rem 0"></span>
<span style="height:15%;background:blue;display: flex;justify-content:space-between;align-items: center;">
<span style="font-size: 2rem">123</span>
<button style="width: 25%">+</button>
</span>
</li>
<li style="width: 30%;height: 20rem;background: black;margin: 1rem"></li>
<li style="width: 30%;height: 20rem;background: black;margin: 1rem"></li>
<li style="width: 30%;height: 20rem;background: black;margin: 1rem"></li>
<li style="width: 30%;height: 20rem;background: black;margin: 1rem"></li>
<li style="width: 30%;height: 20rem;background: black;margin: 1rem"></li> </ul> </div> </span>
<span style="width:14.28%;background:blue"></div> </div>
<footer style="width:100%;height:14.28%;display: flex">
<span style="width: 75%;height: 100%">
<div style="display: flex;height: 100%;flex-direction: column;">
<span style="height: 20%;background: green;width: 100%"></span>
<span style="height:80%;width: 100%">
<ul style="width: 100%;height: 100%;display: flex;flex-direction: row;overflow-x: auto;"> <li style="width: 10rem;height: 100%;display: flex;flex-direction: column;margin: 0 0.5rem;flex-shrink:0">
<span style="background:black ;height: 55%;width: 100%"></span>
<span style="height:10%;background:black;margin-top: 0.3rem ;width: 100%"> </span>
<span style="height:10%;background:black;margin: 0.3rem 0;width: 100%"> </span>
<span style="height:15%;background:blue;width: 100%"></span> </li>
<li style="width: 10rem;height: 100%;display: flex;flex-direction: column;margin: 0 0.5rem;flex-shrink:0">
<span style="background:black ;height: 55%;width: 100%"></span>
<span style="height:10%;background:black;margin-top: 0.3rem ;width: 100%"> </span>
<span style="height:10%;background:black;margin: 0.3rem 0;width: 100%"> </span>
<span style="height:15%;background:blue;width: 100%"></span> </li>
<li style="width: 10rem;height: 100%;display: flex;flex-direction: column;margin: 0 0.5rem;flex-shrink:0">
<span style="background:black ;height: 55%;width: 100%"></span>
<span style="height:10%;background:black;margin-top: 0.3rem ;width: 100%"> </span>
<span style="height:10%;background:black;margin: 0.3rem 0;width: 100%"> </span>
<span style="height:15%;background:blue;width: 100%"></span> </li>
<li style="width: 10rem;height: 100%;display: flex;flex-direction: column;margin: 0 0.5rem;flex-shrink:0">
<span style="background:black ;height: 55%;width: 100%"></span>
<span style="height:10%;background:black;margin-top: 0.3rem ;width: 100%"> </span>
<span style="height:10%;background:black;margin: 0.3rem 0;width: 100%"> </span>
<span style="height:15%;background:blue;width: 100%"></span> </li>
<li style="width: 10rem;height: 100%;display: flex;flex-direction: column;margin: 0 0.5rem;flex-shrink:0">
<span style="background:black ;height: 55%;width: 100%"></span>
<span style="height:10%;background:black;margin-top: 0.3rem ;width: 100%"> </span>
<span style="height:10%;background:black;margin: 0.3rem 0;width: 100%"> </span>
<span style="height:15%;background:blue;width: 100%"></span> </li>
<li style="width: 10rem;height: 100%;display: flex;flex-direction: column;margin: 0 0.5rem;flex-shrink:0">
<span style="background:black ;height: 55%;width: 100%"></span>
<span style="height:10%;background:black;margin-top: 0.3rem ;width: 100%"> </span>
<span style="height:10%;background:black;margin: 0.3rem 0;width: 100%"> </span>
<span style="height:15%;background:blue;width: 100%"></span> </li>
<li style="width: 10rem;height: 100%;display: flex;flex-direction: column;margin: 0 0.5rem;flex-shrink:0">
<span style="background:black ;height: 55%;width: 100%"></span>
<span style="height:10%;background:black;margin-top: 0.3rem ;width: 100%"> </span>
<span style="height:10%;background:black;margin: 0.3rem 0;width: 100%"> </span>
<span style="height:15%;background:blue;width: 100%"></span> </li>
<li style="width: 10rem;height: 100%;display: flex;flex-direction: column;margin: 0 0.5rem;flex-shrink:0">
<span style="background:black ;height: 55%;width: 100%"></span>
<span style="height:10%;background:black;margin-top: 0.3rem ;width: 100%"> </span>
<span style="height:10%;background:black;margin: 0.3rem 0;width: 100%"> </span>
<span style="height:15%;background:blue;width: 100%"></span> </li>
<li style="width: 10rem;height: 100%;display: flex;flex-direction: column;margin: 0 0.5rem;flex-shrink:0">
<span style="background:black ;height: 55%;width: 100%"></span>
<span style="height:10%;background:black;margin-top: 0.3rem ;width: 100%"> </span>
<span style="height:10%;background:black;margin: 0.3rem 0;width: 100%"> </span>
<span style="height:15%;background:blue;width: 100%"></span> </li>
<li style="width: 10rem;height: 100%;display: flex;flex-direction: column;margin: 0 0.5rem;flex-shrink:0">
<span style="background:black ;height: 55%;width: 100%"></span>
<span style="height:10%;background:black;margin-top: 0.3rem ;width: 100%"> </span>
<span style="height:10%;background:black;margin: 0.3rem 0;width: 100%"> </span>
<span style="height:15%;background:blue;width: 100%"></span> </li> </ul>
</span>
</div>
</span>
<span style="width: 25%">
<div style="display: flex;flex-direction: column;height: 100%;">
<span style="height: 50%;background: black"></span>
<span style="height: 25%;background:blue"></span>
<span style="height: 25%;background: pink"></span>
</div> </span> </footer> </body>
</html>
效果如图：