Differences between substring and substr functions in JS _ javascript tips-js tutorial

StringObject. what is the difference between substring (start, stop) and substr (start, length)? The following describes in detail. If you are interested, refer to section 1. function declaration in JS: stringObject. substring (start, stop)
Start is the start position of the original string search, and stop is the end position of the search. The returned results do not contain the characters indicated by stop.
For example: "hamburger". substring () returns "urge"

2. substr (start, length)
For example, if the value of DETAIL_TYPE is 1111053, substr (DETAIL_TYPE, 111105) =
Take six characters from the first part of DETAIL_TYPE.