在Javascript中…做什么?[副本]

我在这个沙箱里学习VueJs https://codesandbox.io/s/o29j95wx9 它有这样的线条

<script>
export default {
  props: {
    value: {
      type: String,
      default: '',
    }
  },
  computed: {
    listeners () {
      return {
        // Pass all component listeners directly to input
        ...this.$listeners,
        // Override input listener to work with v-model
        input: event => this.$emit('input', event.target.value)
      }
    }
  }
}
</script>

什么是 ... 在里面 ...this.$listeners,

我也看到它在vuex中这样使用

computed: {
   ...mapGetters({
      currentData: 'viewerGetCurrentDocument',
      folders: 'viewerGetFoldersList'
   }),