array includes

陣列包括

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

該軟件包實現了ES-SHIM API接口。它在ES3支持的環境中起作用，並符合擬議的規格。

因為Array.prototype.includes在內的包括接收器（ this值），所以主導出將數組作為第一個參數運行。

需要此包裝的引擎包括：

• 即（所有版本）
• 野生動物園<9
• Firefox <43和99-101
• Chrome <47
• 邊緣<14
• 節點<6

入門

npm install --save array-includes

用法

基本用法： inclage（數組，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' ) ) ; 

測試

只需克隆回購， npm install並運行npm test