Decrement (--) - JavaScript 编辑
The decrement operator (--
) decrements (subtracts one from) its operand and returns a value.
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Syntax
Operator: x-- or --x
Description
If used postfix, with operator after operand (for example, x--
), the decrement operator decrements and returns the value before decrementing.
If used prefix, with operator before operand (for example, --x
), the decrement operator decrements and returns the value after decrementing.
Examples
Postfix decrement
let x = 3;
y = x--;
// y = 3
// x = 2
Prefix decrement
let a = 2;
b = --a;
// a = 1
// b = 1
Specifications
Specification |
---|
ECMAScript (ECMA-262) The definition of 'Decrement operator' in that specification. |
Browser compatibility
BCD tables only load in the browser
See also
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