Javascript - 新方法

Question

如果有人能为我分解它，让我能理解它，我会非常感激。我知道它用于通过 apply 方法创建新对象。

Function.prototype.new = function () {
    var args = arguments;
    var constructor = this;

    function Fake() {
        constructor.apply(this, args)
    };
    Fake.prototype = constructor.prototype;
    return new Fake;
};

Answer 1

基本上，new 函数用于从调用它的对象继承新创建对象的原型(prototype)方法。

// new function is defined on the Function prototype so,
// it can be called directly from any function
Function.prototype.new = function () {
    // Caching the arguments array-like object
    var args = arguments;

    // this inside the new() refers to the function on which the `new` is called
    var constructor = this;

    // A fake constructor function/class
    function Fake() {
        // Calling the function with passing the context and the arguments
        constructor.apply(this, args)
    };

    // Adding the prototype members of the function on which new is called
    // On the new fake class
    Fake.prototype = constructor.prototype;

    // Retun new instance of the fake class
    // Actually returning only the prototypes here
    return new Fake;
};