Is there a library which implements new Javascript/Ecmascript 5 methods for older versions?

问题

Although Ecmascript 5 introduces some completely new features, it also adds some new methods (bind, trim, map, etc.) which should be perfectly possible to implement (albeit slower) in current versions. Does a library exist which implements these backwards compatible features (and no more, excluding Prototype et. al.)

回答1:

Kris Kowal and friends have built the es5-shim. It was part of Narwhal, but now lives on its own:

http://github.com/kriskowal/es5-shim/

Was: I've taken to using the global-es5.js shim from narwhal:

http://github.com/280north/narwhal/blob/master/engines/default/lib/global-es5.js

you'll have to take out the require("json"); line at the bottom, but other than that, it should be browser-clean.

回答2:

Prototype and Underscore implement a lot of those.

回答3:

So, I just gave up and started an ES5 library

回答4:

You might want to check out pulpjs. You can pick the pieces you want to include, and then grab the protocompat module, which will make a bunch of methods available as extensions on the object prototypes.

来源：https://stackoverflow.com/questions/1890464/is-there-a-library-which-implements-new-javascript-ecmascript-5-methods-for-olde