<!doctype html>

 <html lang="en">

 <head>

     <meta charset="UTF-8">

     <title>css头部引用和外部引用哪一个优先级高</title>

     <link rel="stylesheet" href="测试.css">

     <style type="text/css">

     .one{

         color: red;

         font-size: 30px;

     }

     </style>

 </head>

 <body>

     <div>

         <p class="one">用头部引入和外部引入同时对这一句话进行了颜色和字号设置</p>

         <p class="two">只用外部引入对这句话进行颜色和字号设置</p>

     </div>

 </body>

 </html>

 .one,.two{

     color: blue;

     font-size: 50px;

 }