array includes

阵列包括

ES7/ES2016符合规格的Array.prototype.includes /polyfill/replacement，其工作原理一直延伸至ES3。

该软件包实现了ES-SHIM API接口。它在ES3支持的环境中起作用，并符合拟议的规格。

因为Array.prototype.includes在内的包括接收器（ this值），所以主导出将数组作为第一个参数运行。

需要此包装的引擎包括：

• 即（所有版本）
• 野生动物园<9
• Firefox <43和99-101
• Chrome <47
• 边缘<14
• 节点<6

入门

npm install --save array-includes

用法

基本用法： inclage（数组，value [，fromIndex = 0]）

 var includes = require ( 'array-includes' ) ;
var assert = require ( 'assert' ) ;
var arr = [ 'one' , 'two' ] ;

includes ( arr , 'one' ) ; // true
includes ( arr , 'three' ) ; // false
includes ( arr , 'one' , 1 ) ; // false 

例子

 var arr = [
	1 ,
	'foo' ,
	NaN ,
	- 0
] ;

assert . equal ( arr . indexOf ( 0 ) > - 1 , true ) ;
assert . equal ( arr . indexOf ( - 0 ) > - 1 , true ) ;
assert . equal ( includes ( arr , 0 ) , true ) ;
assert . equal ( includes ( arr , - 0 ) , true ) ;

assert . equal ( arr . indexOf ( NaN ) > - 1 , false ) ;
assert . equal ( includes ( arr , NaN ) , true ) ;

assert . equal ( includes ( arr , 'foo' , 0 ) , true ) ;
assert . equal ( includes ( arr , 'foo' , 1 ) , true ) ;
assert . equal ( includes ( arr , 'foo' , 2 ) , false ) ; 

 /* when Array#includes is not present */
delete Array . prototype . includes ;
var shimmedIncludes = includes . shim ( ) ;

assert . equal ( shimmedIncludes , includes . getPolyfill ( ) ) ;
assert . equal ( arr . includes ( 'foo' , 1 ) , includes ( arr , 'foo' , 1 ) ) ; 

 /* when Array#includes is present */
var shimmedIncludes = includes . shim ( ) ;

assert . equal ( shimmedIncludes , Array . prototype . includes ) ;
assert . equal ( arr . includes ( 1 , 'foo' ) , includes ( arr , 1 , 'foo' ) ) ; 

测试

只需克隆回购， npm install并运行npm test