页面自适应rem兼容华为机型

// /**
//  * 通过rem实现页面自适应
//  */
(function (doc, win) {
  var docEl = doc.documentElement
  var resizeEvt = 'orientationchange' in window ? 'orientationchange' : 'resize'
  var recalc = function () {
    var clientWidth = docEl.clientWidth
    if (!clientWidth) return
    if (clientWidth >= 769) {
      docEl.style.fontSize = '100px'
    } else {
      docEl.style.fontSize = 100 * (clientWidth / 375) + 'px'
    }
    var html = document.getElementsByTagName('html')[0]
    var settedFs = parseInt(100 * (clientWidth / 375))
    var settingFs = settedFs
    var whileCount = 0
    while (true) {
      var realFs = parseInt(window.getComputedStyle(html).fontSize)
      var delta = realFs - settedFs
      //不相等
      if (Math.abs(delta) >= 1) {
        if (delta > 0) { settingFs-- } else { settingFs++ }
        html.setAttribute('style', 'font-size:' + settingFs + 'px!important')
      } else { break }
      if (whileCount++ > 100) { break }
    }
  }
  if (!doc.addEventListener) return;
  win.addEventListener(resizeEvt, recalc, false)
  doc.addEventListener('DOMContentLoaded', recalc, false)
})(document, window);