TaskPool 类

Posted 2022-11-25 沿着路走到底

1

class TaskPool 
  tasks = []
  timer = 0
  delayRun(delayTime, callback) 
     console.log('register', delayTime, callback.name)
     this.register(delayTime, callback)
     return this
  

  register(delayTime, callback) 
    this.tasks.push(
      delayTime, 
      callback
    )
    if (this.timer) 
      clearTimeout(this.timer)
    
    this.timer = setTimeout(() => 
      this.run()
    , 200)
  

  run() 
    const fn = this.tasks.shift()
    setTimeout(() => 
      fn.callback()
      if (this.tasks.length) 
        this.run()
      
    , fn.delayTime)
  


const instance = new TaskPool();

instance
  .delayRun(3000, function task1() 
    console.log("run log 1");
  )
  .delayRun(2000, function task2() 
    console.log("run log 2");
  )
  .delayRun(1000, function task3() 
    console.log("run log 3");
  );

setTimeout(() => 
  instance.delayRun(10, function task4() 
    console.log("run log 4");
  );
, 4000);

//打印 register 3000 task1
//打印 register 2000 task2
//打印 register 1000 task3
//过 3 秒打印 run log 1
//打印 register 10 task4
//间隔2秒打印 run log 2
//又间隔1秒打印 run log 3
//又间隔10毫秒打印 run log 4