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This article mainly introduces what is the use of the substr method in JavaScript, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let the editor take you to understand it.

The substr method returns a substring of the specified length starting at the specified location.

StrObj.substr (start [, length])

Description:

The starting position of the substring required by start. The index of the first character in the string is 0.

The number of characters that length should include in the returned substring.

For example:

012345

Var str = "ABCDEF"

Str.substr (2pr 4)

Results: CDEF

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