Mathematical functions in Javascript_Basic knowledge
May 16, 2016 pm 07:15 PMIn 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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