JS method of splitting strings

js How to split strings

The applicable scenarios are different

const arr=['1-2','1-3','2-3','3-4'];

1、string.split()

With special character segmentation

'1-2'.split('-')
// ['1', '2']

2、String.substring(start,stop)

start It's necessary . A nonnegative integer , Specifies that the first character of the substring to be extracted is in string Position in .
stop Optional , A nonnegative integer , The head is not the tail , You need to add 1.

'hello'.substring(1,3)
// 'el'

3、 Use String.substr(start,lenght) Split string

start It's necessary . The starting subscript of the substring to extract . It must be a number . If it's a negative number , Then this parameter declares the position from the end of the string . in other words ,-1 Refers to the last character in the string ,-2 Refers to the penultimate character , And so on .

length Optional . The number of characters in the substring . It must be a number . If this parameter is omitted , Then return from string A string from the beginning to the end of .

'hello'.substr(1,3)
// 'ell'

4、 Use String.slice(start,end) Split string

Extract a part of the string , And return the extracted part with a new string .

'hello'.slice(1,3)
// 'el'