Js substring () string truncation Function

Usage:
Copy codeThe Code is as follows:
Str. substring (start, end)
"String Literal". substring (start, end)


"Start" indicates the starting position of the string to be truncated. The index starts from 0.
"End" indicates the end position of the string to be truncated. The index starts from 0.

In JavaScript, the substring () function returns a string that contains a substring from start to the end (excluding end.

In JavaScript, the substring () function uses a small value in start and end as the starting point of the substring. For example, strvar. substring (0, 3) and strvar. substring (3, 0) return the same substring. If start or end is NaN or negative, replace it with 0. The length of the substring is equal to the absolute value of the difference between start and end. For example, the length of the substring returned in strvar. substring (0, 3) and strvar. substring (3, 0) is 3.

The following example demonstrates how to use the substring function in JavaScript:

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