Assignment operators - JavaScript Tutorial - w3Schools - Chapter-11 English
JavaScript Assignment Operators
Assignment operators assign values to JavaScript variables.
The = assignment operator assigns a value to a variable.
The += assignment operator adds a value to a variable.
The -= assignment operator subtracts a value from a variable.
The *= assignment operator multiplies a variable.
The /= assignment divides a variable.
The %= assignment operator assigns a remainder to a variable.