created () {
    // 当前页面允许双指缩放
    document
      .querySelector('meta[name="viewport"]')
      .setAttribute('content', 'width=device-width, initial-scale=1')
  },
  beforeRouteLeave (to, from, next) {
    // 离开页面取消双指缩放
    document
      .querySelector('meta[name="viewport"]')
      .setAttribute(
        'content',
        'width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no'
      )
    next()
  },