lovecoding
/
W0407


			
				
					
						
						
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							<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0,maximum-scale=1.0,user-scaleble=no">
    <title>Document</title>
    <style>
        /* 根元素16px 最小12px  */
        #box {
            /* 根据根元素字体大小适配 */
            width: 3rem;
            height: 3rem;
            background: #00f;
            font-size: 20px;
        }
        p {
            /* em根据父元素字体大小适配 */
            font-size: 2em;
        }
    </style>
</head>
<body>
    <div id="box">
        <p>你好</p>
    </div>
    <script src="./rem封装.js"></script>
</body>
</html>