;(function (win, doc) {
  'use strict'
  // 设计稿宽度
  var designWidth = 750
  // 屏幕旋转事件：orientationchange
  // var resizeEvt = 'orientationchange' in win ? 'orientationchange' : 'resize'
  // 重计算方法
  var recalc = function () {
    var docEl = doc.documentElement
    // window.orientation 已从Web标准中删除
    var orientation
    if (win.screen.orientation) {
      orientation = win.screen.orientation.angle
    } else {
      orientation = win.orientation
    }
    var clientWidth = docEl.clientWidth
    if (orientation === 0 || orientation === 180) {
      // 竖屏 portrait
      clientWidth = docEl.clientWidth
    } else if (orientation === 90 || orientation === 270 || orientation === -90) {
      // 横屏 landscape
      clientWidth = docEl.clientHeight
    }
    // 以设计稿宽度为最大限制
    // clientWidth = clientWidth > designWidth ? designWidth : clientWidth
    var fontSize = clientWidth / designWidth * 100
    docEl.style.fontSize = fontSize + 'px'
  }
  // 绑定事件
  // win.addEventListener(resizeEvt, recalc, false)
  doc.addEventListener('DOMContentLoaded', recalc, false)
})(window, document)