vue 获取父组件

dispatch(componentName, eventName, params) {
        var parent = this.$parent || this.$root
        var name = parent.$options.componentName
        while (parent && (!name || name !== componentName)) {
          parent = parent.$parent
          if (parent) {
            name = parent.$options.componentName
          }
        }
        if (parent) {
          parent.$emit.apply(parent, [eventName].concat(params))
        }
      }

 this.dispatch('MagicCheckboxGroup', 'change', [this._checkboxGroup.value])