题目：实现一个 LazyMan，按照以下方式调用时，得到相关输出：
LazyMan('Hank')
// Hi! This is Hank!
LazyMan('Hank').sleep(10).eat('dinner')
// Hi! This is Hank!
// 等待 10 秒..
// Wake up after 10
// Eat dinner~
LazyMan('Hank').eat('dinner').eat('supper')
// Hi This is Hank!
// Eat dinner~
// Eat supper~
LazyMan('Hank').sleepFirst(5).eat('supper')
// 等待 5 秒
// Wake up after 5
// Hi This is Hank!
// Eat supper
代码实现：
class LazyManCreator {
constructor(name) {
this.taskList = []
const task = () => {
console.log(`Hi! This is ${name}!`)
this.next()
}
this.taskList.push(task)
setTimeout(() => {
this.next()
}, 0)
}
next() {
const task = this.taskList.shift()
task && task()
}
sleep(timeout) {
const task = () => {
setTimeout(() => {
console.log(`Wake up after ${timeout}`)
this.next()
}, timeout * 1000)
}
this.taskList.push(task)
return this
}
sleepFirst(timeout) {
const task = () => {
setTimeout(() => {
console.log(`Wake up after ${timeout}`)
this.next()
}, timeout * 1000)
}
this.taskList.unshift(task)
return this
}
eat(meal) {
const task = () => {
console.log(`Eat ${meal}`)
this.next()
}
this.taskList.push(task)
return this
}
}
const LazyMan = name => {
return new LazyManCreator(name)
}
console.log('==============')
LazyMan('Hank').sleepFirst(5).eat('supper')
追加一道类似的题目：实现下面这道题中的machine函数
function machine() {
}
machine('ygy').execute()
// start ygy
machine('ygy').do('eat').execute();
// start ygy
// ygy eat
machine('ygy').wait(5).do('eat').execute();
// start ygy
// wait 5s（这里等待了5s）
// ygy eat
machine('ygy').waitFirst(5).do('eat').execute();
// wait 5s
// start ygy
// ygy eat
代码实现：
function machine(name) {
class Machine {
constructor(name) {
this.name = name
this.taskList = []
const task = () => {
console.log(`start ${this.name}`)
this.next()
}
this.taskList.push(task)
}
next() {
const task = this.taskList.shift()
task && task()
}
execute() {
this.next()
}
do(something) {
const task = () => {
console.log(`${this.name} ${something}`)
this.next()
}
this.taskList.push(task)
return this
}
wait(timeout) {
const task = () => {
console.log(`wait ${timeout}s`)
setTimeout(() => {
this.next()
}, 1000 * timeout)
}
this.taskList.push(task)
return this
}
waitFirst(timeout) {
const task = () => {
console.log(`wait ${timeout}s`)
setTimeout(() => {
this.next()
}, 1000 * timeout)
}
this.taskList.unshift(task)
return this
}
}
return new Machine(name)
}