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Subtraction Assignment Operator (-=) (JavaScript)

Subtracts the value of an expression from the value of a variable and assigns the result to the variable.

Copy

result -= expression

Arguments

result: Any numeric variable.
expression: Any numeric expression.

Remarks

Using the -= operator is exactly the same as doing the following:

JavaScript

Copy

result = result – expression

Requirements

Supported in the following document modes: Quirks, Internet Explorer 6 standards, Internet Explorer 7 standards, Internet Explorer 8 standards, Internet Explorer 9 standards. See Version Information.

Reference

Subtraction Operator (-) (JavaScript)

Concepts

Operator Precedence (JavaScript)

Operator Summary (JavaScript)

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