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Mathematical functions in Javascript_Basic knowledge

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May 16, 2016 pm 07:15 PM

In Javascript, mathematical methods can be divided into the following categories:
constants, power functions, trigonometic functions, rounding functions, random numbers Number)

Constant and power functions

Math.E	自然对数的底(为常数)	2.718
Math.LN10	10的自然对数	2.302
Math.LN2	2的自然对数	0.693
Math.PI	圆周率	3.1415
Math.SQRT1_2	1/2的平方根	0.707
Math.SQRT2	2的平方根	1.414
Math.sqrt(x)	X的平方根	更X的值有关
Math.pow(x, n)	返回x的n次方的数值	参数为x和n
Math.log(n)	返回n的自然对数	参数为n
Math.exp(n)	返回e的n次方的数值	参数为n

Trigonometric functions

Math.cos(x)	X的余弦函数
Math.sin(x)	X的正弦函数
Math.tan(x)	X的正切函数
Math.acos(y)	X的反余弦函数
Math.asin(y)	X的反正弦函数
Math.atan(y)	X的反正切函数

Note here: The units of the parameter x and the return value of the inverse function are all in radians (for example, PI radians = 180 degrees)

Rounding functions and random numbers

Math.random()	产生从0到1的随机数
Math.round(x)	取最接近整数x的数值
Math.floor(x)	取最接近整数x并且比x小的数值
Math.ceil(x)	取最接近整数x并且比x大的数值
Math.min(a, b, c)	返回参数列表中最小的数值
Math.max(a, b, c)	返回参数列表中最大的数值

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