​javascript面试题，实现链式调用

// 实现一个链式调用

// hello.name("George").sleep(3).like("sports");

// log：I'm George

// 3s后log：sleep after 3s

// log：I like sports

思路：

1. 根据要求构建new一个对象 const hello = {}
2. 在对象中构建函数name,sleep,like

const hello = {    name(name){},    sleep(time){},    like(sport){}
}

3. 填充hello对象内部方法和参数，定义一个tasks数组保存任务，然后再从任务列表每次取出一个任务执行，如下：

const hello = {  tasks: [],  
    name(name) {    const fn = () => { console.log(`I am ${name}`);   this.run();    
};    
this.tasks.push(fn);    return this;  },  sleep(time) {    const fn = () => {      setTimeout(() => {        console.log(`sleep after ${time}`);        this.run();      }, time * 1000);    };    this.tasks.push(fn);    return this;  }, 
like(sport) {    const fn = () => {      console.log(`I like ${sport}`);      this.run();    };    this.tasks.push(fn);    this.run();    return this;  },// 取出任务执行    run() {    const fn = this.tasks.shift();    fn && fn();  },
};