Overview of using Math object methods in JavaScript_Basic knowledge

1. Discard the decimal part and keep the integer part
parseInt(5/2)

2. Round up, if there is a decimal, add 1 to the integer part

Math.ceil(5/2)

3, rounded up.

Math.round(5/2)

4, round down

Math.floor(5/2)

Methods of Math object
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 the number 1 2 3
asin(x) Returns the inverse of the number Chord value 1 2 3
atan(x) Returns the arctangent of x as a value between -PI/2 and PI/2 radians 1 2 3
atan2(y,x) Returns the value from x Angle from axis to point (x,y) (between -PI/2 and PI/2 radians) 1 2 3
ceil(x) Rounds up a number. 1 2 3
cos(x) Returns the cosine of a number 1 2 3
exp(x) Returns the exponent of e. 1 2 3
floor(x) rounds a number down. 1 2 3
log(x) Returns the natural logarithm of the number (base e) 1 2 3
max(x,y) Returns the highest value between x and y 1 2 3
min(x ,y) Returns the lowest value between x and y 1 2 3
pow(x,y) Returns x raised to the y power 1 2 3
random() Returns a random number between 0 ~ 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() represents the source code of the object 1 4 -
valueOf() returns the original value of a Math object