vue响应式Object代理对象的修改和删除属性

const ITERATE_KEY=symbol()
const p = new Proxy(obj,{
 set(target,key,newVal,receiver){
        const res = Reflect.set(target,key,newVal,receiver)
        trigger(target,key)
        return res
  }
}

//定义常量，在ts中可以使用枚举
const TriggerType = {
    SET:'SET',
    ADD:'ADD'
}
const p = new Proxy(obj,{
 set(target,key,newVal,receiver){
         //判断新增还是修改
         const type = Object.prototype.hasOwnProperty.call(target,key) 
         ? TriggerType.SET
         : TriggerType.ADD
        const res = Reflect.set(target,key,newVal,receiver)
        trigger(target,key,type)
        return res
  }
}

const trigger = (target,key,type)=>{
    const depsMap = targetMap.get(target)
    if(!depsMap){
        return 
    }
    const effects = depsMap.get(key)
    // 再次去重
    const needToRun = new Set()
    if(effects){
        effects.forEach(e=> e!==activeEffect
            ? needToRun.add(e)
            : ''
        )
    }
    if(type === TriggerType.ADD){
        const otherEffects = depsMap.get(ITERATE_KEY)
        if(otherEffects){
            otherEffects.forEach(e=> e!==activeEffect
                ? needToRun.add(e)
                : ''
            )
        }
    }
    if(needToRun.length){
        needToRun.forEach(fn=> fn?.options?.scheduler ? fn.options.scheduler(fn) : fun())
    }
}

const TriggerType = {
    SET:'SET',
    ADD:'ADD',
    DEL:'DELETE'
}

const p = new Proxy(obj,{
 deleteProperty(target,key){
         //判断属性存在，你总不能删除一个不存在的属性吧
        const hadKey = Object.prototype.hasOwnProperty.call(target,key)  
        const res = Reflect.deleteProperty(target,key)
        if(res && hadKey){
            trigger(target,key,TriggerType.DEL)
        }
        return res
  }
}

// 删除这句
- if(type === TriggerType.ADD){
// 改为
+ if([TriggerType.ADD,TriggerType.DEL].includes(type)){