function Macbook() {
this.cost = function () {
return 1000;
};
}
function Memory(macbook) {
this.cost = function () {
return macbook.cost() + 75;
};
}
function BlurayDrive(macbook) {
this.cost = function () {
return macbook.cost() + 300;
};
}
function Insurance(macbook) {
this.cost = function () {
return macbook.cost() + 250;
};
}
// 用法
var myMacbook = new Insurance(new BlurayDrive(new Memory(new Macbook())));
console.log(myMacbook.cost());
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