JS Take integer

1. Discard the fractional part, preserving the whole number of parts
parseint (5/2)

2. Rounding up, with decimals on the integer part plus 1

Math.ceil (5/2)

3. Rounding.

Math.Round (5/2)

4. Rounding Down

Math.floor (5/2)

Methods for 5.Math objects
Ff:firefox, N:netscape, Ie:internet Explorer

Method Description FF N IE
ABS (x) absolute value of the return number
ACOs (x) inverse cosine of the return number
ASIN (x) inverse sine value of the return number
Atan (x) returns the inverse tangent of x with a value between-PI/2 and PI/2 radians
ATAN2 (y,x) returns the angle from the x-axis to the point (X, y) (between-PI/2 and PI/2 radians)
Ceil (x) rounds a number
COS (x) The cosine of the return number
EXP (x) returns the exponent of E
Floor (x) rounds down a number
Log (x) The natural logarithm of the number of returns (Bottom is E)
Max (x, y) returns the highest value in X and Y
Min (x, y) returns the lowest value in X and Y
Pow (x, y) returns the Y power of X
Random () returns the number 0 ~ 1
Round (x) rounding a number to the nearest integer
Sin (x) the sine of the number of returns
sqrt (x) The square root of the number of returns
Tan (x) returns the tangent of a corner
Tosource () represents the source code of the object
ValueOf () returns the original value of a Math object

Have time to write in detail ....