js实现lazyman(流程控制)

function _lazyMan(name) {
    this.name = name;
    this.task = [];
    this.default();
    var _this = this;
    setTimeout(function() {
        _this.next();
    }, 0)


}
_lazyMan.prototype.next = function() {
    var fn = this.task.shift();
    fn && fn();
}
_lazyMan.prototype.default = function() {
    var _this = this;
    var fn = (function(name) {
        return function() {
            console.log("Hi!This is " + name);
            _this.next();
        }
    })(this.name);
    this.task.push(fn);
    return this;
}
_lazyMan.prototype.sleep = function(num) {
    var _this = this;
    var fn = (function() {
        return function() {
            setTimeout(function() {
                console.log("wait after" + num);
                _this.next();
            }, num * 1000)
        }
    })();
    this.task.push(fn);
    return this;
}
_lazyMan.prototype.sleepFirst = function(num) {
    var _this = this;
    var fn = (function() {
        return function() {
            setTimeout(function() {
                console.log("Wait first after " + num)
                _this.next();
            }, num * 1000)
        }
    })();
    this.task.unshift(fn);
    return this;
}
_lazyMan.prototype.eat = function(some) {
    var _this = this;
    var fn = (function() {
        return function() {
            console.log("Eating " + some);
        }
    })();
    this.task.push(fn);
    return this;
}


function LazyMan(name) {
    return new _lazyMan(name);
}

var a = LazyMan("hank").sleep(2).eat("some").sleepFirst(1);