Both string methods essentially have the same functionality, which is to return a specific portion of the string variable. While reviewing JavaScript during my daily Anki spaced repetition review, my ...

JavaScript String substr() method : The substr() method is used to extract the sub-string from a string. It counts the index from 0. It returns the number of characters starts from the first parameter ...

1 substring(from, to) : 截取字符串从from到to-1的位置，小标从0开始，对于原始的字符串并不会改变而是返回一个新的字符串。 2 ...