第一种，媒体查询：
@media (min-width:0px){ html{font-size:12px;}}@media (min-width: 320px){ html{font-size:12px;}}@media (min-width: 340px){ html{font-size:13px;}}@media (min-width: 360px){ html{font-size:14px;}}@media (min-width: 380px){ html{font-size:15px;}}@media (min-width: 400px){ html{font-size:15px;}}@media (min-width: 420px){ html{font-size:16px;}}第二种：页面插入js（推荐）：
<script type="text/javascript"> function fontSize(){ var deviceWidth=document.documentElement.clientWidth>768?768:document.documentElement.clientWidth; document.documentElement.style.fontSize=(deviceWidth/25)+"px"; } fontSize(); window.onresize=fontSize;</script>
插入一段我自己写的测试例子：
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0" /> <title>自适应字体大小和元素高度</title> <style type="text/css"> *{margin: 0;padding: 0;text-align: center;} h1{font-size: 2rem;padding: 2rem;} p{font-size: 1rem;padding: 1px;} div{width: 5rem;height: 4rem;background-color: #f00;} </style> <script type="text/javascript" src="http://code.jquery.com/jquery-latest.js"></script> <script type="text/javascript"> function fontSize(){ var deviceWidth=document.documentElement.clientWidth>768?768:document.documentElement.clientWidth; document.documentElement.style.fontSize=(deviceWidth/25)+"px"; } fontSize(); window.onresize=fontSize; </script></head><body> <h1>标题</h1> <p>内容</p> <div></div></body></html>
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