?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();
     },
   };

   4.执行结果

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