# Mathematical function set in Javascript _ basic knowledge

Source: Internet
Author: User
Mathematical functions in Javascript are set in Javascript. mathematical methods can be divided into the following types:
Constans (constant), power functions (multiplication function), trigonometic functions (trigonometric function), rounding functions (rounding function), random numbers (random number)

Reference
Constants and multiplication functions

Math. E base (constant) of the natural logarithm 2.718
Math. LN10 10's natural logarithm of 2.302
Math. LN2 2's natural logarithm 0.693
Math. PI circumference rate 3.1415
Math. SQRT1_2 1/2 square root 0.707
Square root of Math. SQRT2 2 1.414
The square root of Math. sqrt (x) X is related to the value of X.
Math. pow (x, n) returns the n power of x. The numerical parameters are x and n.
Math. log (n) returns the natural logarithm of n as n.
Math. exp (n) returns the n power of e. The value parameter is n.

Trigonometric function

Cosine function of Math. cos (x) X
Sine function of Math. sin (x) X
Math. tan (x) X tangent function
Inverse cosine function of Math. acos (y) X
Math. asin (y) X inverse sine function
Arctangent function of Math. atan (y) X

Note: The unit of the return values of parameter x and inverse functions is radian (for example, PI radian = 180 degrees)

Rounding functions and random numbers

Math. random () generates a random number from 0 to 1
Math. round (x) returns the value closest to integer x.
Math. floor (x) is a value that is closest to integer x and smaller than x.
Math. ceil (x) is a value closest to integer x and greater than x.
Math. min (a, B, c) returns the smallest value in the parameter list.
Math. max (a, B, c) returns the maximum value in the parameter list.

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