je-lee / reactive-data Goto Github PK

export function defineReactive(ob, key, val){
  // 执行观察
  let childObserve = observe(val),
    dep = new Dep()
  Object.defineProperty(ob, key, {
    configurable: true,
    enumerable: true,
    get: () => {
      if(Dep.target){
        // 依赖收集
        // Dep.target 是一个watcher
        dep.addDep(Dep.target)
      }
      return val 
    },
    set: newVal => {
      if(newVal === val) return 
      val = newVal 
      // 如果新赋值的是个object
      childObserve = observe(val)
      dep.notify()
    }
  })
}