实现函数LazyMan，使得：
LazyMan('Hank'); 输出
Hi Hank!LazyMan('Hank').eat('dinner');输出
Hi Hank!Eat dinner!LazyMan('Hank').sleep(5).eat('dinner'); 输出
Hi Hank!//等待五秒Eat dinner!LazyMan('Hank').sleepFirst(5).eat('dinner');输出
//等待五秒Hi Hank!Eat dinner!实现代码：
function LazyMan(name) { lp.taskList.push('Hi ' + name + '!'); return lp.exe();}var lp = LazyMan.prototype;lp.taskList = []; lp.eat = function(v) { lp.taskList.push('Eat ' + v + '!'); return lp.exe();}lp.sleep = function(t) { lp.taskList.push('sleep ' + t); return lp.exe();}lp.sleepFirst = function(t) { lp.taskList.unshift('sleep ' + t); return lp.exe();}lp.taskStart = false;lp.exe = function() { var that = this; if(!lp.taskStart) { lp.taskStart = true; setTimeout(function() { doTask(lp.taskList); that.taskList = []; }, 0); } return lp;}function doTask(taskList) { if(taskList.length) { var task = taskList.shift(); if(task.indexOf('sleep') !== -1) { var match = task.split(' '); var t = parseInt(match[1]); setTimeout(function(){ doTask(taskList); }, t * 1000); } else { console.log(task); doTask(taskList); } }}// LazyMan('Hank');// LazyMan('Hank').eat('dinner');// LazyMan('Hank').sleep(5).eat('dinner');LazyMan('Hank').sleepFirst(5).eat('dinner');