移动端踩坑

const designWidth = 375
const scale = document.documentElement.clientWidth/designWidth
let viewport = document.querySelector('meta[name='viewport']')
let content = 'width=device-width' + ',initial-scale=' + scale +  ',minimum-scale=' + scale +
',maximum-scale=' + scale +  ',user-scalable=no'
viewport.setAttribute('content', content)