实现一个LazyMan,可以按照以下方式调用:
LazyMan('Hank')输出:
Hi! This is Hank!
LazyMan('Hank').sleep(10).eat('dinner')输出
Hi! This is Hank!
//等待10秒..
Wake up after 10
Eat dinner~
LazyMan('Hank').sleep(10).eat('dinner').eat('supper')输出
Hi This is Hank!
Eat dinner~
Eat supper~
LazyMan('Hank').sleepFirst(5).eat('supper')输出
//等待5秒
Wake up after 5
Hi This is Hank!
Eat supper~
以此类推。
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参考答案:
function LazyMan(name) {
if(!(this instanceof LazyMan)){
return new LazyMan(name)
}
const cb = (next)=>{
console.log(`Hi This is ${name}!`)
next()
}
this.cbs = [cb];
setTimeout(()=>{
this.next()
},0)
}
LazyMan.prototype.eat = function (food){
const cb = (next)=>{
console.log(`Eat ${food}~`)
next()
}
this.cbs.push(cb);
return this
}
LazyMan.prototype.sleepFirst = function (time){
const cb = (next)=>{
setTimeout(()=>{
next()
},time*1000)
}
this.cbs.unshift(cb);
return this
}
LazyMan.prototype.sleep = function(time){
const cb = (next)=>{
setTimeout(()=>{
next()
},time*1000)
}
this.cbs.push(cb);
return this
}
LazyMan.prototype.next = function(){
if(this.cbs.length <= 0)return
const first = this.cbs.shift()
first(this.next.bind(this))
}