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 |