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constructor-inherit.js
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67 lines (53 loc) · 1.37 KB
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function MyConstructor(){
}
// JS Engine이 실제로 수행하는 일
MyConstructor.prototype = Object.create(Object.prototype, {
constructor: {
configurable: true,
enumerable: true,
value: MyConstructor,
writable: true
}
});
function Rectangle(length, width){
this.length = length;
this.width = width;
}
Rectangle.prototype.getArea = function(){
return this.length * this.width;
}
Rectangle.prototype.toString = function(){
return "[Rectangle " + this.length + "x" + this.width + "]";
}
function Square(size){
this.length = size;
this.width = size;
}
// 생성자 상속
// Square.prototype = new Rectangle();
// Square.prototype.constructor = Square;
var util = require('util');
util.inherits(Square, Rectangle);
Square.prototype.toString = function(){
return "[Square " + this.length + "x" + this.width + "]";
};
var rect = new Rectangle(5,10);
var square = new Square(6);
console.log(rect.getArea());
console.log(square.getArea());
console.log(rect.toString());
console.log(square.toString());
console.log(square instanceof Square);
console.log(square instanceof Rectangle);
console.log(square instanceof Object);
// 생성자 상속
function inherits(child, parent){
child.prototype = Object.create(parent.prototype, {
constructor: {
configurable: true,
enumerable: true,
value: constructor,
writable: true
}
});
}