vue 监听横屏竖屏

mounted () {
 ...
  window.addEventListener('resize', this.renderResize, false)
 ...
},
methods: {
...
  renderResize () {
    let width = document.documentElement.clientWidth
    let height = document.documentElement.clientHeight
    if (width > height) {
      alert('横屏')
    }
  },
 ...
}