(2) Module （模块）模式

 var Car = {
        color: ‘white‘,
        getCarPrice: function () {
        },
        getCarColor: function () {
            console.log(this.color);
        }
    };
    Car.getCarColor();

var testModule = function(){
        var privateValue = 1;
        var publicValue = 2;
        var privateMethod = function(){};
        var publicMethod = function(){
            console.log(privateValue);
        };

        var service = {
            publicMethod:publicMethod,
            publicValue:publicValue
        };
        return service;
    };
    testModule().publicMethod();//1
    testModule().privateMethod();//undefined is not a function
    testModule().privateValue;//no error , just console nothing

var testModule = (function(){
        var privateValue = 1;
        var publicValue = 2;
        var privateMethod = function(){};
        var publicMethod = function(){
            console.log(publicValue);
        };

        var service = {
            publicMethod:publicMethod,
            publicValue:publicValue
        };
        return service;
    })();
    testModule.publicMethod();//2
    testModule.publicValue = 3;
    testModule.publicMethod();//2 无法修改，

var testModule = (function(){
        var privateValue = 1;
        var publicValue = 2;
        var privateMethod = function(){};
        var publicMethod = function(){
            console.log(publicValue);
        };
        var setPublicValue = function(value){
            publicValue = value;
        };

        var service = {
            publicMethod:publicMethod,
            publicValue:publicValue,
            setPublicValue:setPublicValue
        };
        return service;
    })();
    testModule.publicMethod();//2
    testModule.setPublicValue(4);
    testModule.publicMethod();//4