(function(doc, win) {
    this.width = 750 // 设置默认最大宽度
    this.fontSize = 34 // 默认字体大小
    this.widthProportion = () => {
      let p = (document.body && document.body.clientWidth || document.getElementsByTagName("html")[0].offsetWidth) / this.width
      let s = document.body && document.body.clientWidth
      console.log(s, p)
      return s > 414 ? 0.5 : (p > 1 ? 1 : p < 0.5 ? 0.5 : p)
    }
    console.log('widthProportion is : ' , this.widthProportion())
    this.changePage = () => {
      document.getElementsByTagName("html")[0].setAttribute('style', `font-size: ${this.widthProportion() * this.fontSize}px !important`)
    }
    this.changePage()
    window.addEventListener('resize', () => {
      this.changePage()
    }, false)
  })(document, window)