实现 LazyMan

[weijiyang]

实现以下效果

LazyMan("Hank").sleep(5).eat("supper")

输出
Hi! This is Hank!
//等待5秒
Wake up after 5
Hi This is Hank!
Eat supper

[weijiyang]

(function(window, undefined){
    var taskList = [];
    // 类
    function LazyMan(){};
    LazyMan.prototype.eat = function(str){
        subscribe("eat", str);
        return this;
    };
    LazyMan.prototype.sleep = function(num){
        subscribe("sleep", num);
        return this;
    };
    LazyMan.prototype.sleepFirst = function(num){
        subscribe("sleepFirst", num);
        return this;
    };
    // 订阅
    function subscribe(){
        var param = {},
            args = Array.prototype.slice.call(arguments);
        if(args.length < 1){
            throw new Error("subscribe 参数不能为空!");
        }
        param.msg = args[0];
        param.args = args.slice(1); // 函数的参数列表
        if(param.msg == "sleepFirst"){
            taskList.unshift(param);
        }else{
            taskList.push(param);
        }
    }
    // 发布
    function publish(){
        if(taskList.length > 0){
            run(taskList.shift());
        }
    }
    // 鸭子叫
    function run(option){
        var msg = option.msg,
            args = option.args;
        switch(msg){
            case "lazyMan": lazyMan.apply(null, args);break;
            case "eat": eat.apply(null, args);break;
            case "sleep": sleep.apply(null,args);break;
            case "sleepFirst": sleepFirst.apply(null,args);break;
            default:;
        }
    }
    // 具体方法
    function lazyMan(str){
        lazyManLog("Hi!This is "+ str +"!");
        publish();
    }
    function eat(str){
        lazyManLog("Eat "+ str +"~");
        publish();
    }
    function sleep(num){
        setTimeout(function(){
            lazyManLog("Wake up after "+ num);
            publish();
        }, num*1000);

    }
    function sleepFirst(num){
        setTimeout(function(){
            lazyManLog("Wake up after "+ num);
            publish();
        }, num*1000);
    }
    // 输出文字
    function lazyManLog(str){
        console.log(str);
    }
    // 暴露接口
    window.LazyMan = function(str){
        subscribe("lazyMan", str);
        setTimeout(function(){
            publish();
        }, 0);
        return new LazyMan();
    };
})(window);