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提交练习 #134

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15 changes: 15 additions & 0 deletions Observable.js
Original file line number Diff line number Diff line change
Expand Up @@ -11,12 +11,22 @@ class ObserverList {
}
add(observer) {
// todo add observer to list
this.observerList.push(observer)
}
remove(observer) {
// todo remove observer from list
let inx = this.observerList.indexOf(observer)
if (inx > -1) {
this.observerList.splice(inx, 1)
return true
} else {
return '没有该观察者'
}

}
count() {
// return observer list size
return this.observerList.length
}
}

Expand All @@ -26,12 +36,17 @@ class Subject {
}
addObserver(observer) {
// todo add observer
this.observers.add(observer)
}
removeObserver(observer) {
// todo remove observer
this.observers.remove(observer)
}
notify(...args) {
// todo notify
this.observers.observerList.forEach(observer => {
observer.update && observer.update(...args)
})
}
}

Expand Down
24 changes: 24 additions & 0 deletions PubSub.js
Original file line number Diff line number Diff line change
Expand Up @@ -13,14 +13,38 @@ module.exports = class PubSub {

subscribe(type, fn) {
// todo subscribe
this.subscribers[type] = this.subscribers[type] || []
// 增加监听事件
this.subscribers[type].push(fn)
}

unsubscribe(type, fn) {
// todo unsubscribe
// 未监听该事件
let ary = this.subscribers[type]
if (!ary) {
return '未监听该类型的事件'
}
// 解除该监听事件
let inx = ary.indexOf(fn)
if (inx > -1) {
ary.splice(inx, 1)
return true
} else {
return '该类型上没有该事件'
}
}

publish(type, ...args) {
// todo publish
let ary = this.subscribers[type]
if (!ary) {
return
}
// 触发该订阅事件
ary.forEach(fn => {
fn(...args)
})
}

}