移动端字体适配方案

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本文主要从两方面适配

1.remjs 字体适配

2.postcss pxtorem 字体适配

1.字体适配 REM.JS

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/**
 * rem.js
 * 随分辨率变化设置根font-size大小
 * 使字体自适应变化
 * @author Marong
 */

(function(win) {
  let time
  const doc = document
  const baseSize = 100 // 1rem = 100px
  const designWidth = 375
  const maxWidth = 750
  let width = doc.documentElement.getBoundingClientRect().width
  const height = doc.documentElement.clientHeight

  // 判断横竖屏状态
  let screenVertical = true
  if (width <= height) {
    screenVertical = true
  } else {
    screenVertical = false
  }

  // 设置根字体大小
  function setRem() {
    if (width > maxWidth) { // 最大宽度
      width = maxWidth
    }
    const rem = screenVertical
      ? width * baseSize / designWidth // 横屏
      : height * baseSize / designWidth // 竖屏
    doc.documentElement.style.fontSize = rem + 'px'
  }

  // 浏览器缩放时
  win.addEventListener('resize', function() {
    clearTimeout(time) // 防止执行两次
    time = setTimeout(setRem, 300)
  }, false)

  // 浏览器后退的时候重新计算
  win.addEventListener('pageshow', function(e) {
    if (e.persisted) {
      clearTimeout(time)// 防止执行两次
      time = setTimeout(setRem, 300)
    }
  }, false)

  setRem()
})(window)

2.PostCss pxtorem

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// main.js
import 'lib-flexible/flexible.js'
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// .postcssrc.js
module.exports = {
  plugins: {
    autoprefixer: {
      overrideBrowserslist: ['Android 4.1', 'iOS 7.1', 'Chrome > 31', 'ff > 31', 'ie >= 8']
    },
    'postcss-pxtorem': {
      rootValue: 100,
      propList: ['*']
    }
  }
}