Microsoft JScript
-= Operator |
Language Reference
Version 1 |
Used to subtract the value of an expression from a variable.
result -= expression The -= operator syntax has these parts:
Part Description result Any numeric variable. expression Any numeric expression.
Using the -= operator is exactly the same as doing the following:
result = result - expression
For information on when a run-time error is generated by the - operator, see the Operator Behavior table.