_.includes()方法用于查找该值是否在集合中。如果集合是字符串,则将测试它的值子字符串,否则将使用SameValueZero()方法进行相等性比较。如果给定索引并且该索引为负,则从集合的末尾索引测试该值作为偏移量。
用法:
_.includes( collection, value, index )
参数:此方法接受上述和以下所述的三个参数:
- collection:此参数保存要检查的集合。集合可以是数组,对象或字符串。
- value:此参数保存要搜索的值。
- index:此参数保存要搜索的索引。
返回值:如果在集合中找到该值,则此方法返回true,否则返回false。
范例1:
Javascript
// Requiring the lodash library
const _ = require("lodash");
// Collection of string
var name = [ 'gfg', 'geeks', 'computer', 'science', 'portal' ];
// Check value is found or not by _.includes() method
console.log(_.includes(name, 'computer'));
// Check value is found or not by _.includes() method
console.log(_.includes(name, 'geeeks'));
// Check value is found or not by _.includes() method
console.log(_.includes(name, 'gfg', 2));
输出:
true false false
范例2:
Javascript
// Requiring the lodash library
const _ = require("lodash");
// Collection of integer value
var name = [ 10, 15, 20, 25, 30 ];
// Check value is found or not by _.includes() method
console.log(_.includes(name, 25));
// Check value is found or not by _.includes() method
console.log(_.includes(name, 35));
// Check value is found or not by _.includes() method
console.log(_.includes(name, 25, 3));
输出:
true false true
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注:本文由纯净天空筛选整理自sanjoy_62大神的英文原创作品 Lodash _.includes() Method。非经特殊声明,原始代码版权归原作者所有,本译文未经允许或授权,请勿转载或复制。