// 由父组件传来的值 model & onLineModelList
props: {
    model: { 
      type: Object,
      required: true
    },
    onLineModelList: {
      type: Array,
      required: true
    }
  },

// 监听 onLineModelList 如果发生变化则执行方法
  watch: {
    // 注意： function (newQuestion, oldQuestion) 这个形参是写死的
    onLineModelList: function (newQuestion, oldQuestion) {
      for (var a = 0; a < newQuestion.length; a++) {
        if (this.model.imId !== null && this.model.imId !== '' && this.model.imId === newQuestion[a].imId) {
          this.model.realUserCount = newQuestion[a].onLineUserCount
        }
      }
    }
  },
  methods: {