create a class

createClass.js

var createClass = function (Parent, props) {
    if (arguments.length === 1) {
        props = Parent;
        Parent = null;
    }

    var Child, F, i;

    // 1. 构造函数
    Child = function Klass() {
        if (Child.uber && Child.uber.hasOwnProperty("__construct")) {
            Child.uber.__construct.apply(this, arguments);
        }
        if (Child.prototype.hasOwnProperty("__construct")) {
            Child.prototype.__construct.apply(this, arguments);
        }
    };

    // 2. 继承
    Parent = Parent || Object;
    F = function () {};
    F.prototype = Parent.prototype;
    Child.prototype = new F();
    Child.uber = Parent.prototype;
    Child.prototype.constructor = Child;

    // 3. 添加方法实现
    for (i in props) {
        if (props.hasOwnProperty(i)) {
            Child.prototype[i] = props[i];
        }
    }

    // 返回“类”
    return Child;
};