Subtraction Assignment Operator (-=)

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

语法

result -= expression

参数

result

Any numeric variable.

expression

Any numeric expression.

备注

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

result = result - expression

必备条件

在以下文档模式中受支持：怪异模式、Internet Explorer 6标准模式、Internet Explorer 7标准模式、Internet Explorer 8标准模式、Internet Explorer 9标准模式、Internet Explorer 10标准模式、Internet Explorer 11标准模式。应用商店应用（Windows 8和Windows Phone 8.1）中也受支持。请参阅版本信息。