JS Math object's method _ Basic knowledge

1. Discard the fractional part and keep the whole number of parts

parseint (5/2)

2. Take up the whole, there are decimal numbers on the whole part plus 1

Math.ceil (5/2)

3, rounded.

Math.Round (5/2)

4, take the whole down.

Math.floor (5/2)

Math Object method

Ff:firefox, Ie:internet Explorer

Method	Description	FF	IE
ABS (x)	Returns the absolute value of a number.	1	3
ACOs (x)	Returns the inverse cosine of a number.	1	3
ASIN (x)	Returns the inverse chord value of a number.	1	3
Atan (x)	Returns the inverse tangent of x to the value between-PI/2 and PI/2 radians.	1	3
ATAN2 (y,x)	Returns the angle (between-PI/2 and PI/2 radians) from the X axis to point (X,y).	1	3
Ceil (x)	The logarithm is rounded up.	1	3
COS (x)	Returns the cosine of a number.	1	3
EXP (x)	Returns the index of E.	1	3
Floor (x)	The logarithm is rounded down.	1	3
Log (x)	Returns the natural logarithm of the number (the bottom is e).	1	3
Max (X,y)	Returns the highest value in X and Y.	1	3
Min (x,y)	Returns the lowest value in X and Y.	1	3
Pow (x,y)	Returns the Y-power of X.	1	3
Random ()	Returns the random number between 0 ~ 1.	1	3
Round (x)	Round the number to the nearest integer.	1	3
Sin (x)	Returns the sine of a number.	1	3
sqrt (x)	Returns the square root of a number.	1	3
Tan (x)	Returns the tangent of the angle.	1	3
Tosource ()	Returns the source code for this object.	1	-
ValueOf ()	Returns the original value of the Math object.	1	4