JavaScript面向对象编程（10）快速构建继承关系之对象拷贝

/**
 * 通过拷贝继承对象的属性和行为
 * @param {Object} p 父对象
 */
function extendCopy(p) {
	var c = {};
	for (var i in p) {
		c[i] = p[i];
	}
	c.uber = p;
	return c;
}

var shape = {
	name: 'shape',
	toString: function() {return this.name;}
}
var twoDee = extendCopy(shape);
twoDee.name = '2D shape';
twoDee.toString = function(){return this.uber.toString() + ', ' + this.name;};

var triangle = extendCopy(twoDee);
triangle.name = 'Triangle';
triangle.getArea = function(){return this.side * this.height / 2;}
//使用继承而来的toString方法
alert(triangle.toString());

/**
 * 深度拷贝
 * @param {Object} p  父对象
 * @param {Object} c  子对象
 */
function deepCopy(p, c) {
	var c = c || {};
	for (var i in p) {
		if (typeof p[i] === 'object') {
			c[i] = (p[i].constructor === Array) ? [] : {};
			deepCopy(p[i], c[i]);
		} else {
			c[i] = p[i];
		}
	}
	return c;
}