Definition and Usage
定义与用法

The valueOf() method returns the primitive value of a Math object.
valueOf()方法可以返回Math对象的原始值

The primitive value is inherited by all objects descended from the Math object.
原始值可以被所有来自Math对象的子对象所继承。

The valueOf() method is usually called automatically by JavaScript behind the scenes and not explicitly in code.
JS可以在后台自动调用valueOf()方法，而不需要明确的代码

Syntax
语法

mathObject.valueOf()

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