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<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>RunJS</title>
</head>
<body>
<div class="wrap" >
</div>
</body>
</html>
输入 JavaScript 代码……
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html,body {
height: 100%;
margin: 0px;
padding: 0px;
}
div.wrap {
background: pink;
/*wrap 最大高宽比为4:3，居中*/
height: 100vh;
max-width: 75vh;
margin:0 auto 0 auto
