方法一: 通过 sreenfull 插件

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<template>
  <div>
    <svg-icon :icon-class="isFullscreen?'exit-fullscreen':'fullscreen'" @click="click" />
  </div>
</template>

<script>
import screenfull from 'screenfull'

export default {
  name: 'Screenfull',
  data() {
    return {
      isFullscreen: false
    }
  },
  mounted() {
    this.init()
  },
  beforeDestroy() {
    this.destroy()
  },
  methods: {
    click() {
      if (!screenfull.enabled) {
        this.$message({
          message: 'you browser can not work',
          type: 'warning'
        })
        return false
      }
      screenfull.toggle()
    },
    change() {
      this.isFullscreen = screenfull.isFullscreen
    },
    init() {
      if (screenfull.enabled) {
        screenfull.on('change', this.change)
      }
    },
    destroy() {
      if (screenfull.enabled) {
        screenfull.off('change', this.change)
      }
    }
  }
}
</script>

<style scoped>
.screenfull-svg {
  display: inline-block;
  cursor: pointer;
  fill: #5a5e66;;
  width: 20px;
  height: 20px;
  vertical-align: 10px;
}
</style>

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 <screenfull id="screenfull" class="right-menu-item hover-effect" />

.right-menu-item {
      display: inline-block;
      padding: 0 8px;
      height: 100%;
      font-size: 18px;
      color: #5a5e66;
      vertical-align: text-bottom;

      &.hover-effect {
        cursor: pointer;
        transition: background .3s;

        &:hover {
          background: rgba(0, 0, 0, .025)
        }
      }
    }

方法二: js

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<template>
  <div v-if="showFullScreenBtn" class="full-screen-btn-con">
    <Tooltip :content="value ? '退出全屏' : '全屏'" placement="bottom">
      <Icon @click.native="handleChange" :type="value ? 'md-contract' : 'md-expand'" :size="23"></Icon>
    </Tooltip>
  </div>
</template>

<script>
export default {
  name: 'Fullscreen',
  computed: {
    showFullScreenBtn () {
      return window.navigator.userAgent.indexOf('MSIE') < 0
    }
  },
  props: {
    value: {
      type: Boolean,
      default: false
    }
  },
  methods: {
    handleFullscreen () {
      let main = document.body
      if (this.value) {
        if (document.exitFullscreen) {
          document.exitFullscreen()
        } else if (document.mozCancelFullScreen) {
          document.mozCancelFullScreen()
        } else if (document.webkitCancelFullScreen) {
          document.webkitCancelFullScreen()
        } else if (document.msExitFullscreen) {
          document.msExitFullscreen()
        }
      } else {
        if (main.requestFullscreen) {
          main.requestFullscreen()
        } else if (main.mozRequestFullScreen) {
          main.mozRequestFullScreen()
        } else if (main.webkitRequestFullScreen) {
          main.webkitRequestFullScreen()
        } else if (main.msRequestFullscreen) {
          main.msRequestFullscreen()
        }
      }
    },
    handleChange () {
      this.handleFullscreen()
    }
  },
  mounted () {
    let isFullscreen = document.fullscreenElement || document.mozFullScreenElement || document.webkitFullscreenElement || document.fullScreen || document.mozFullScreen || document.webkitIsFullScreen
    isFullscreen = !!isFullscreen
    document.addEventListener('fullscreenchange', () => {
      this.$emit('input', !this.value)
      this.$emit('on-change', !this.value)
    })
    document.addEventListener('mozfullscreenchange', () => {
      this.$emit('input', !this.value)
      this.$emit('on-change', !this.value)
    })
    document.addEventListener('webkitfullscreenchange', () => {
      this.$emit('input', !this.value)
      this.$emit('on-change', !this.value)
    })
    document.addEventListener('msfullscreenchange', () => {
      this.$emit('input', !this.value)
      this.$emit('on-change', !this.value)
    })
    this.$emit('input', isFullscreen)
  }
}
</script>

<style lang="less">
.full-screen-btn-con .ivu-tooltip-rel{
  height: 64px;
  line-height: 56px;
  i{
    cursor: pointer;
  }
}
</style>

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<fullscreen v-model="isFullscreen" />