html2canvas截图，安卓手机只可以截取当前可视区域，iPhone没这个问题，再怎么解决

Question

screenShot () {

  let el = document.getElementsByClassName('box')
  let img = this.$refs.img
  html2canvas(el, {
    useCORS: true,
    onrendered: function (canvas) {
      let url = canvas.toDataURL()
      img.src = url
      img.crossOrigin = "Anonymous"
    }
  })
}