includes

概要Description

签名

s.includes(searchString: string, from?: number): boolean

功能

用于判断 字符串 s 是否包含 指定的子字符串 searchString

如果找到匹配的字符串 searchString 则返回 true，否则返回 false

第二个参数 from 可选，设置从 from 位置开始查找，默认为 0

案例Examples

正常情况

1 2  =
s = 'hi, zzax';result = s.includes('zzax');true

区分大小写

1 2  =
s = 'hi, zzax';result = s.includes('ZZAX');false

第二个参数 from

从此位置开始查找

1 2  =
s = 'hi, zzax';result = s.includes('hi', 1);false

1 2  =
s = 'hi, zzax';result = s.includes('zzax', 1);true

可为负

负数相当于从 0 位置开始找

1 2  =
s = 'hi, zzax';result = s.includes('hi', -1);true