object keys

对象键

一个 Object.keys 垫片。如果不可用，则调用其“shim”方法来填充 Object.keys。

最常见的用法：

 var keys = Object . keys || require ( 'object-keys' ) ; 

例子

 var keys = require ( 'object-keys' ) ;
var assert = require ( 'assert' ) ;
var obj = {
	a : true ,
	b : true ,
	c : true
} ;

assert . deepEqual ( keys ( obj ) , [ 'a' , 'b' , 'c' ] ) ; 

 var keys = require ( 'object-keys' ) ;
var assert = require ( 'assert' ) ;
/* when Object.keys is not present */
delete Object . keys ;
var shimmedKeys = keys . shim ( ) ;
assert . equal ( shimmedKeys , keys ) ;
assert . deepEqual ( Object . keys ( obj ) , keys ( obj ) ) ; 

 var keys = require ( 'object-keys' ) ;
var assert = require ( 'assert' ) ;
/* when Object.keys is present */
var shimmedKeys = keys . shim ( ) ;
assert . equal ( shimmedKeys , Object . keys ) ;
assert . deepEqual ( Object . keys ( obj ) , keys ( obj ) ) ; 

来源

直接取自 es5-shim 的实现，并进行了修改，包括来自 lodash 的修改。

测试

只需克隆存储库、 npm install并运行npm test