使用闭包封装一个汽车对象，可以获取汽车状态

var Car = (function(){    var speed;    function setSpeed(n){        speed = n;    }    function getSpeed(){        return speed;    }    function accelerate(){        speed += 10;    }    function decelerate(){        speed -= 10;    }    function getStatus(){        if(speed>0){            return 'running';        }else{            return 'stop';        }    }    return {        'setSpeed': setSpeed,        'getSpeed': getSpeed,        'accelerate':accelerate,        'decelerate':decelerate,        'getStatus':getStatus    }})();    Car.setSpeed(30);    Car.getSpeed(); //30    Car.accelerate();    Car.getSpeed(); //40;    Car.decelerate();    Car.decelerate();    Car.getSpeed(); //20    Car.getStatus(); // 'running';    Car.decelerate();     Car.decelerate();    Car.getStatus();  //'stop';

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