IE8 getPrototypeOf method

问题

Pretty simple:

I have code using Object.getPrototypeOf(...) to get the inherited classes of a Dojo Widget (just a JS object). Object.getPrototypeOf(...) isn't supported in IE8. I need an IE work around. Any ideas? Thanks in advance.

回答1:

Jon Resig's polyfill works http://ejohn.org/blog/objectgetprototypeof/

I have made it even smaller

if (typeof Object.getPrototypeOf !== "function")
    Object.getPrototypeOf = "".__proto__ === String.prototype
        ? function (object) {
            return object.__proto__;
        }
        : function (object) {
            // May break if the constructor has been tampered with
            return object.constructor.prototype;
        };

回答2:

Use https://github.com/kriskowal/es5-shim. Among other things, it supports Object.getPrototypeOf.

Source: ECMAScript 5 polyfills from Modernizr project

回答3:

Classes created with Dojo.declared store metadata with their superclasses so you don't need to use getPrototypeOf.

I think you can get the first superclass with

MyClass.prototype.constructor._meta.bases[1]

and its prototype with

MyClass.prototype.constructor._meta.bases[1].prototype

(bases[0] seems to be the class itself)

---

Although why are you even needing to get the prototype? Its very likely you will end up reimplementing some feature that is already provided by dojo.declare

来源：https://stackoverflow.com/questions/10919915/ie8-getprototypeof-method