我最近开始学习Javascript，如果我的怀疑对你来说不合逻辑，很抱歉
我看过Math对象的定义，下面是它的代码

interface Math {
    /** The mathematical constant e. This is Euler's number, the base of natural logarithms. */
    readonly E: number;
    /** The natural logarithm of 10. */
    readonly LN10: number;
    /** The natural logarithm of 2. */
    readonly LN2: number;
    /** The base-2 logarithm of e. */
    readonly LOG2E: number;
    /** The base-10 logarithm of e. */
    readonly LOG10E: number;
    /** Pi. This is the ratio of the circumference of a circle to its diameter. */
    readonly PI: number;
    /** The square root of 0.5, or, equivalently, one divided by the square root of 2. */
    readonly SQRT1_2: number;
    /** The square root of 2. */
    readonly SQRT2: number;
    /**
     * Returns the absolute value of a number (the value without regard to whether it is positive or negative).
     * For example, the absolute value of -5 is the same as the absolute value of 5.
     * @param x A numeric expression for which the absolute value is needed.
     */
    abs(x: number): number;
    /**
     * Returns the arc cosine (or inverse cosine) of a number.
     * @param x A numeric expression.
     */
    acos(x: number): number;
    /**
     * Returns the arcsine of a number.
     * @param x A numeric expression.
     */
    asin(x: number): number;
    /**
     * Returns the arctangent of a number.
     * @param x A numeric expression for which the arctangent is needed.
     */
    atan(x: number): number;
    /**
     * Returns the angle (in radians) from the X axis to a point.
     * @param y A numeric expression representing the cartesian y-coordinate.
     * @param x A numeric expression representing the cartesian x-coordinate.
     */
    atan2(y: number, x: number): number;
    /**
     * Returns the smallest integer greater than or equal to its numeric argument.
     * @param x A numeric expression.
     */
    ceil(x: number): number;
    /**
     * Returns the cosine of a number.
     * @param x A numeric expression that contains an angle measured in radians.
     */
    cos(x: number): number;
    /**
     * Returns e (the base of natural logarithms) raised to a power.
     * @param x A numeric expression representing the power of e.
     */
    exp(x: number): number;
    /**
     * Returns the greatest integer less than or equal to its numeric argument.
     * @param x A numeric expression.
     */
    floor(x: number): number;
    /**
     * Returns the natural logarithm (base e) of a number.
     * @param x A numeric expression.
     */
    log(x: number): number;
    /**
     * Returns the larger of a set of supplied numeric expressions.
     * @param values Numeric expressions to be evaluated.
     */
    max(...values: number[]): number;
    /**
     * Returns the smaller of a set of supplied numeric expressions.
     * @param values Numeric expressions to be evaluated.
     */
    min(...values: number[]): number;
    /**
     * Returns the value of a base expression taken to a specified power.
     * @param x The base value of the expression.
     * @param y The exponent value of the expression.
     */
    pow(x: number, y: number): number;
    /** Returns a pseudorandom number between 0 and 1. */
    random(): number;
    /**
     * Returns a supplied numeric expression rounded to the nearest integer.
     * @param x The value to be rounded to the nearest integer.
     */
    round(x: number): number;
    /**
     * Returns the sine of a number.
     * @param x A numeric expression that contains an angle measured in radians.
     */
    sin(x: number): number;
    /**
     * Returns the square root of a number.
     * @param x A numeric expression.
     */
    sqrt(x: number): number;
    /**
     * Returns the tangent of a number.
     * @param x A numeric expression that contains an angle measured in radians.
     */
    tan(x: number): number;
}

当我在谷歌上搜索它的时候，我发现它是用TypeScript写的，这里的接口是用来定义一个对象的结构的，这个对象是Math，但在我看来，它就像一个类声明，那么为什么我们要把Math作为一个对象来调用呢？