xuechunL

{"lastUpload":"2020-02-12T02:30:43.197Z","extensionVersion":"v3.4.3"}

xuechunL

Strings

String.prototype.*

None of the string methods modify this – they always return fresh strings.

• charAt(pos: number): string ^ES1

  Returns the character at index pos, as a string (JavaScript does not have a datatype for characters). str[i] is equivalent to str.charAt(i) and more concise (caveat: may not work on old engines).