Subtraction assignment (-=)

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The subtraction assignment operator (-=) subtracts the value of the right operand from a variable and assigns the result to the variable.

语法

Operator: x -= y
Meaning:  x  = x - y

Examples

Using subtraction assignment

// Assuming the following variable
//  bar = 5

bar -= 2     // 3
bar -= 'foo' // NaN

Specifications

Specification
ECMAScript (ECMA-262)
Assignment operators

Browser compatibility

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See also