mirror of https://github.com/jkjoy/sunpeiwen.git
77 lines
2.5 KiB
Markdown
77 lines
2.5 KiB
Markdown
#object-keys <sup>[![Version Badge][npm-version-svg]][package-url]</sup>
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[![Build Status][travis-svg]][travis-url]
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[![dependency status][deps-svg]][deps-url]
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[![dev dependency status][dev-deps-svg]][dev-deps-url]
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[![License][license-image]][license-url]
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[![Downloads][downloads-image]][downloads-url]
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[![npm badge][npm-badge-png]][package-url]
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[![browser support][testling-svg]][testling-url]
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An Object.keys shim. Invoke its "shim" method to shim Object.keys if it is unavailable.
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Most common usage:
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```js
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var keys = Object.keys || require('object-keys');
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```
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## Example
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```js
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var keys = require('object-keys');
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var assert = require('assert');
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var obj = {
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a: true,
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b: true,
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c: true
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};
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assert.deepEqual(keys(obj), ['a', 'b', 'c']);
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```
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```js
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var keys = require('object-keys');
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var assert = require('assert');
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/* when Object.keys is not present */
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delete Object.keys;
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var shimmedKeys = keys.shim();
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assert.equal(shimmedKeys, keys);
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assert.deepEqual(Object.keys(obj), keys(obj));
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```
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```js
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var keys = require('object-keys');
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var assert = require('assert');
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/* when Object.keys is present */
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var shimmedKeys = keys.shim();
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assert.equal(shimmedKeys, Object.keys);
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assert.deepEqual(Object.keys(obj), keys(obj));
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```
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## Source
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Implementation taken directly from [es5-shim][es5-shim-url], with modifications, including from [lodash][lodash-url].
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## Tests
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Simply clone the repo, `npm install`, and run `npm test`
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[package-url]: https://npmjs.org/package/object-keys
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[npm-version-svg]: http://versionbadg.es/ljharb/object-keys.svg
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[travis-svg]: https://travis-ci.org/ljharb/object-keys.svg
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[travis-url]: https://travis-ci.org/ljharb/object-keys
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[deps-svg]: https://david-dm.org/ljharb/object-keys.svg
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[deps-url]: https://david-dm.org/ljharb/object-keys
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[dev-deps-svg]: https://david-dm.org/ljharb/object-keys/dev-status.svg
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[dev-deps-url]: https://david-dm.org/ljharb/object-keys#info=devDependencies
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[testling-svg]: https://ci.testling.com/ljharb/object-keys.png
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[testling-url]: https://ci.testling.com/ljharb/object-keys
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[es5-shim-url]: https://github.com/es-shims/es5-shim/blob/master/es5-shim.js#L542-589
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[lodash-url]: https://github.com/lodash/lodash
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[npm-badge-png]: https://nodei.co/npm/object-keys.png?downloads=true&stars=true
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[license-image]: http://img.shields.io/npm/l/object-keys.svg
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[license-url]: LICENSE
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[downloads-image]: http://img.shields.io/npm/dm/object-keys.svg
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[downloads-url]: http://npm-stat.com/charts.html?package=object-keys
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