移动端适配方案之viewport适配

直接上代码，下方width给的数据是基于设计稿给的宽度。

<script>
    const WIDTH = 750
    const mobileAdapter = () => {
      let scale = screen.width/WIDTH
      let content = `width=${WIDTH}, initial-scale=${scale}, maximum-scale=${scale}, minimum-scale=${scale}`
      let meta = document.querySelector('meta[name=viewport]')
      if(!meta) {
        meta = document.createElement('meta')
        meta.setAttribute('name', 'viewport')
        document.head.appendChild(meta)
      } 
      meta.setAttribute('content', content)
    }
    mobileAdapter()
    window.onorientationchange = mobileAdapter
  </script>