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移动端布局原理
搬砖来学php
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值的计算方式
如果当前设备的”视觉视口为375px ,用 100vw 表示 100vw = 375px，1vw = 100vw/100 = 375px/100 = 3.75px
当人为设置html {font-size: 100px}=1rem = 100px

  1.     1vw=3.75px:
  2.     100vw=375px  
  3.     2.人为设置 1rem=100px

1.使用VW+rem来实现动态拉伸 字体随页面宽度增减

  1.     html{
  2.         font-size: 100px;
  3.         font-size: calc(100vw / 3.75);
  4.     }

2.使用媒体查询给页面设置宽度大于470px的时候固定的字体大小为最大20px

  1.     @media (min-width: 470px) {
  2.         html {
  3.             font-size: 125px;
  5.     }

3.完整代码

  1. <!DOCTYPE html>
  2. <html lang="en">
  3. <head>
  4.     <meta charset="UTF-8">
  5.     <meta http-equiv="X-UA-Compatible" content="IE=edge">
  6.     <meta name="viewport" content="width=device-width, initial-scale=1.0">
  7.     <title>Document</title>
  8. </head>
  9. <style>
  10.     /* 1vw=3.75px:
  11.     100vw=375px  
  12.     2.人为设置 1rem=100px  */
  14.     /* 使用VW+rem来实现动态拉伸 字体随页面宽度增减 */
  15.     html{
  16.         font-size: 100px;
  17.         font-size: calc(100vw / 3.75);
  18.     }
  19.     /* 重置body默认字号为16px */
  20.     body{
  21.         font-size: 0.16rem;  /*计算方式16px/100=0.16rem*/
  22.     }
  23.         /* 媒体查询 */
  24.     /* 当给页面设置宽度大于470px的时候固定的字体大小为最大20px */
  25.     @media (min-width: 470px) {
  26.         html {
  27.             font-size: 125px;
  29.     }
  30. }
  31. </style>
  32. <body>
  33. <div class="zihao">php中文网</div>
  36. </body>
  37. </html>
Correcting teacher：PHPzPHPz

Correction status：qualified

Teacher's comments：
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