In JavaScript, the Math object method can be rounded up and rounded up. If there is a decimal number, the integer part is added to 1, rounded down, and so on. The following describes in detail 1. Discard the decimal part and retain the integer part.
ParseInt (5/2)
2. rounded up. If there is a decimal number, add 1 to the integer part.
Math. ceil (5/2)
3. rounding.
Math. round (5/2)
4. Round down
Math. floor (5/2)
Math object Method
FF: Firefox, N: Netscape, IE: Internet Explorer
Method description FF N IE
Abs (x) returns the absolute value of the number 1 2 3
Acos (x) returns the inverse cosine of numbers 1 2 3
Asin (x) returns the inverse sine value of the number 1 2 3
Atan (x) returns the arc tangent of x with a value between-PI/2 and PI/2 radian. The value is 1 2 3.
Atan2 (y, x) returns the angle (between-PI/2 and PI/2 radian) from the x-axis to the point (x, y). 1 2 3
Ceil (x) rounds up a number. 1 2 3
Cos (x) returns the cosine of the number 1 2 3
Exp (x) returns the e index. 1 2 3
Floor (x) is used to remove a number. 1 2 3
Log (x) returns the natural logarithm of the number (Base e) 1 2 3
Max (x, y) returns the highest value of 1 2 3 in x and y.
Min (x, y) returns the minimum value of 1 2 3 in x and y.
Pow (x, y) returns x's y power 1 2 3
Random () returns 0 ~ Random number between 1 1 2 3
Round (x) rounds a number to the nearest integer 1 2 3.
Sin (x) returns the sine of the number 1 2 3
Sqrt (x) returns the square root of the number 1 2 3
Tan (x) returns the tangent of an angle 1 2 3
ToSource () indicates the source code of the object 1 4-
ValueOf () returns the original value of a Math object.