构建类之间的继承关系

[lvleihere]

/**
 * 构建类之间的继承关系
 *
 * @param {Function} subClass 子类函数
 * @param {Function} superClass 父类函数
 */
function inherits(subClass, superClass) {
    var subClassProto = subClass.prototype;
    var F = new Function();
    F.prototype = superClass.prototype;
    subClass.prototype = new F();
    subClass.prototype.constructor = subClass;
    extend(subClass.prototype, subClassProto);
}

/**
 * 对象属性拷贝
 *
 * @param {Object} target 目标对象
 * @param {Object} source 源对象
 * @return {Object} 返回目标对象
 */
function extend(target, source) {
    for (var key in source) {
        if (source.hasOwnProperty(key)) {
            var value = source[key];
            if (typeof value !== 'undefined') {
                target[key] = value;
            }
        }
    }

    return target;
}