直接上代码

注：这里是在vue中使用的，根据需要自行调整

<template>
    <video ref="myVideo" class="w-100 h-100" controls="controls" :src="videoUrl"></video>
</template>

<script>
export default {

   name: 'video',

    mounted() {
        const myVideo = this.$refs.myVideo
        this.$nextTick(() => {
            myVideo.addEventListener('play', this._bindHandlerFull)
            myVideo.addEventListener('ended', this._unbindHandlerFull)
          })
    },
    methods:{
        // bind
        _bindHandlerFull() {
          const myVideo = this.$refs.myVideo
          console.log('开始播放')
          this.launchFullscreen(myVideo)
        },

        // unbind
        _unbindHandlerFull() {
          console.log('播放结束')
          //檢查瀏覽器是否處於全屏
          if (
            this.invokeFieldOrMethod(document, 'FullScreen') ||
            this.invokeFieldOrMethod(document, 'IsFullScreen') ||
            document.IsFullScreen
          ) {
            this.exitFullscreen()
          }
        },

    // 反射调用
    invokeFieldOrMethod(element, method) {
      var usablePrefixMethod
      ;['webkit', 'moz', 'ms', 'o', ''].forEach(function(prefix) {
        if (usablePrefixMethod) return
        if (prefix === '') {
          // 无前缀，方法首字母小写
          method = method.slice(0, 1).toLowerCase() + method.slice(1)
        }
        var typePrefixMethod = typeof element[prefix + method]
        if (typePrefixMethod + '' !== 'undefined') {
          if (typePrefixMethod === 'function') {
            usablePrefixMethod = element[prefix + method]()
          } else {
            usablePrefixMethod = element[prefix + method]
          }
        }
      })

      return usablePrefixMethod
    },

    // 进入全屏
    launchFullscreen(element) {
      //此方法不可以在異步任務中執行，否則火狐無法全屏
      if (element.requestFullscreen) {
        element.requestFullscreen()
      } else if (element.mozRequestFullScreen) {
        element.mozRequestFullScreen()
      } else if (element.msRequestFullscreen) {
        element.msRequestFullscreen()
      } else if (element.oRequestFullscreen) {
        element.oRequestFullscreen()
      } else if (element.webkitRequestFullscreen) {
        element.webkitRequestFullScreen()
      } else {
        var docHtml = document.documentElement
        var docBody = document.body
        var videobox = document.getElementById('videobox')
        var cssText = 'width:100%;height:100%;overflow:hidden;'
        docHtml.style.cssText = cssText
        docBody.style.cssText = cssText
        videobox.style.cssText = cssText + ';' + 'margin:0px;padding:0px;'
        document.IsFullScreen = true
      }
    },

    // 退出全屏
    exitFullscreen() {
      if (document.exitFullscreen) {
        document.exitFullscreen()
      } else if (document.msExitFullscreen) {
        document.msExitFullscreen()
      } else if (document.mozCancelFullScreen) {
        document.mozCancelFullScreen()
      } else if (document.oRequestFullscreen) {
        document.oCancelFullScreen()
      } else if (document.webkitExitFullscreen) {
        document.webkitExitFullscreen()
      } else {
        var docHtml = document.documentElement
        var docBody = document.body
        var videobox = document.getElementById('videobox')
        docHtml.style.cssText = ''
        docBody.style.cssText = ''
        videobox.style.cssText = ''
        document.IsFullScreen = false
      }
    }
    }


}

</script>