题目

实现一个LazyMan，可以按照以下方式调用:

LazyMan(“Hank”)输出:

Hi! This is Hank!

LazyMan(“Hank”).sleep(10).eat(“dinner”)输出

Hi! This is Hank!

//等待10秒..

Wake up after 10

Eat dinner~

LazyMan(“Hank”).eat(“dinner”).eat(“supper”)输出

Hi This is Hank!

Eat dinner~

Eat supper~

LazyMan(“Hank”).sleepFirst(5).eat(“supper”)输出

//等待5秒

Wake up after 5

Hi This is Hank!

Eat supper

以此类推。

简单实现

function lazyman(name) {    return new lazyman.fn.init(name);}lazyman.fn = lazyman.prototype = {    construct: lazyman,    stack: null,    status: 0,    init: function (name) {        this.name = name;        this.stack = [];        return this;    },    sleep: function (time) {        var that = this;        time = +time;        if(time !== time) {            this.next();        } else if(this.status) {            this.stack.unshift(this.sleep.bind(this, time));        } else {            this.status = 1;            this.print(`sleeping ${time} seconds...`);            setTimeout(function () {                that.status = 0;                that.next();            }, time * 1000);        }        return this;    },    next: function () {        while(this.status == 0 && this.stack.length) {            this.print(                this.stack.pop()()            );        }        return this;    },    eat: function(thing) {        this.stack.unshift(lazyEat.bind(null, this.name, thing));        if(this.status == 0) {            this.next();        }        return this;    },    print: console.log}lazyman.fn.init.prototype = lazyman.fn;function lazyEat(name, thing) {    return `${name} eat ${thing}`;}module.exports = lazyman;