code: function registerSubscriber(data) {
          Registry[expose] = data //暴光此函数,方便collectSubscribers收集
          avalon.openComputedCollect = true
          var fn = data.evaluator
          if (fn) { //如果是求值函数
              if (data.type === "duplex") {
                  data.handler()
              } else {
                  data.handler(fn.apply(0, data.args), data.element, data)
              }
          } else { //如果是计算属性的accessor
              data()
          }
          avalon.openComputedCollect = false
          delete Registry[expose]
      }
docs: *******************************************************************
  依赖收集与触发                                *
  ********************************************************************