Popover组件在非自主销毁时会报 Cannot read property 'removeEventListener' of undefined

[daLingZhong]

    mounted () {
      if (this.trigger === 'click') {
        this.$refs.popover.addEventListener('click', this.onClick)
      } else {
        this.$refs.popover.addEventListener('mouseenter', this.open)
        this.$refs.popover.addEventListener('mouseleave', this.close)
      }
    },
    destroyed () {
      if (this.trigger === 'click') {
        this.$refs.popover.removeEventListener('click', this.onClick)
      } else {
        this.$refs.popover.removeEventListener('mouseenter', this.open)
        this.$refs.popover.removeEventListener('mouseleave', this.close)
      }
    },

应该是没有hover或者click触发时组件并不会被实例化，导致eventListener没有被添加，在最后destroyed时就会找不到这个事件监听器，就会出现无法移除报错情况

[FrankFang]

嗯，我应该用 beforeDestroy