任务调度器
class TaskManager{
list = [];
count= 0;
constructor(num){
this.num = num
}
async addTask(fn){
this.count>=this.num?await new Promise(resolve=>{this.list.push(resolve)}):""
this.count++
var result = await fn()
this.count--
if(this.list.length>0){
this.list.shift()()
}
return result
}
}
const tm = new TaskManager(1)
tm.addTask(() => Promise.resolve(10)).then(data => { console.log(data) }) // 10
tm.addTask(() => Promise.resolve(20)).then(data => { console.log(data) }) // 20
LazyMan–sleep
class LazyMan{
constructor(){
this.queue = [start]
function start(resolve){
resolve()
}
setTimeout(()=>{
let start = Promise.resolve()
for(let i = 0 ; i<this.queue.length;i++){
start = start.then(()=>new Promise(this.queue[i]))
}
})
}
addSleep(time){
function addSleep(resolve){
setTimeout(function()){
resolve()
},time)
}
this.queue.push(addSleep)
return this
}
eatFood(){
function eatFun(resolve){
resolve()
}
this.queue.push(eatFun)
return this
}
}
let man = new LazyMan()
man.addSleep(1000).eatFood('haobao').addSleep(1000).eatFood('gg')
delay(console.log, 3, 1000)(‘hello’)
function delay(fn,nums,times){
return async function(content){
for(let i = 0 ; i<nums;i++){
await new Promise(resolve=>{
setTimeout(()=>{
fn.call(this,conent)
resolve()
},times)
})
}
}
}
delay(console.log, 3, 4000)('hello')
