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实例演示移动端布局原理,并描述三大视口之间的换算关系与rem+vw布局的原理与流程
秋闲独醉
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299 people have browsed it
  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>移动端布局原理</title>
  8.   </head>
  9.   <body>
  10.     <div class="title">Hello World</div>
  11.     <!-- 1、单位rem是相对于html根元素的字号值. 
  12.     三个视口：
  13.     1、布局视口:面向开发者，与设备无关默认是980px，用width表示
  14.     2、视觉视口：与设备有关，用width-device表示
  15.     3、理想视口：用视觉视口布局，width= width-device; -->
  17.     <!-- 默认浏览器字号是16px，所以1rem=16px;
  18.     视觉视口用100vw表示,所以1vw ,是根据每个设备的不同表示的像素也不一样
  19.     如iphone6 ,375像素，1vw = 375/100 = 3.75px;
  20.     DPI:设备像素比= 设备像素/css像素
  21.     布局应该用css像素来布局 -->
  23.     <!-- 设置1rem =100px;font-size:100px; 
  24.     通常设计师给的设计稿, 为选择一个相对公认的通用宽度进行设计,一般用iPhone6的"375px"
  25.      求不同设备之间的比例值为 100vw =375px; 1rem=100px; 375px/100px=3.75;
  26.     通过3.75计算出： 
  27.     iphone6/11: 100vw = 375px; 375px/3.75=100px; 100px =1rem; 
  28.     iphone12/13: 100vw = 390px; 390px/3.75=104px; 104px = 1rem;
  29.     iphone11max: 100vw = 414px; 414px/3.75=110.4px; 110.4px = 1rem; -->
  31.     <style>
  32.       html {
  33.         font-size: calc(100vw / 3.75);
  34.       }
  35.       .title {
  36.         font-size: 0.16rem;
  37.       }
  38.       @media (max-width: 375px) {
  39.         /* 设置此时字体号为14px
  40.         14/16=0.875
  41.         100*0.875=87.5px; */
  42.         html {
  43.           font-size: 87.5px;
  44.         }
  45.       }
  47.       @media (min-width: 470px) {
  48.         /* 设置此时字体号为20px
  49.         20/16=1.25
  50.         100*1.25=125px; */
  51.         html {
  52.           font-size: 125px;
  53.         }
  54.       }
  55.     </style>
  56.   </body>
  57. </html>
Correcting teacher：PHPzPHPz

Correction status：qualified

Teacher's comments：
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