1. You cannot explicitly create an Math object, you can simply use it;
2.Math objects cannot store data, which is different from String and Date objects;
3. We know that the parseInt() function will turn a decimal into an integer (so 24.999 becomes 24) by eliminating the 1 cut behind the decimal point.
Here are the methods of the Math object:
round(): When the decimal is 0.5 or greater than 0.5, go up 1 place;
ceil(): always rounding up, so 23.75 becomes 24, so 23.25;
floor(): always rounding down, so 23.75 becomes 23, so 23.25;
<DOCTYPE html>
<html>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8"/>
<head>
<title>Math function </title>
</head>
<script type="text/javascript">
var userInput=prompt(" Please enter the 1 The number of ","");
document.write("round()=",+Math.round(userInput));
document.write("ceil()=",+Math.ceil(userInput));
document.write("floor()=",+Math.floor(userInput));
</script>
<body>
</body>
</html>4. You can use the random() method of the Math object to generate a random decimal that is greater than or equal to 0 but less than 1. Usually in order to take advantage of it, you have to multiply by something, and then use one of the rounding methods.
var diceThrow=Math.round(Math.random()*6)+1;
document.write("You threw a "+diceThrow);Attach methods for the Math object
1. Discard decimal parts and keep integer parts parseInt(5/2) 2. If you round up, add 1 to the whole number if you have a decimal Math.ceil(5/2) 3,4 rounded into 5. Math.round(5/2) 4. Round it down Math.floor(5/2) Methods for the Math object FF: Firefox, N: Netscape, IE: Internet Explorer Methods FF N IE were described abs(x) returns the absolute value of the number 1, 2, 3 acos(x) returns the arccosine of the number 1, 2, 3 asin(x) returns the arcsine of the number 1, 2, 3 atan(x) returns the arctangent value of x 1, 2, 3 with a value between -ES64en /2 and PI/2 radians atan2(y,x) returns the Angle (between -ES74en /2 and PI/2 radians) 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 index of e. 1 2 3 floor(x) rounds down a number. 1 2 3 log(x) returns the natural log of the number (base e) 1, 2, 3 max(x,y) returns the highest value of x and y 1, 2, 3 min(x,y) returns the lowest value of x and y 1, 2, 3 pow(x,y) returns the y power of x 1, 2, 3 random() returns a random number between 0 and 1, 1, 2, 3 round(x) rounds a number 4 to 5 as the nearest integer 1, 2, and 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 1 Angle, 2, 3 toSource() represents the object’s source code 1 4 - valueOf() returns the original value of 1 Math object
Math.abs(num) : Returns the absolute value of num Math.acos(num) : Returns the arccosine value of num Math.asin(num) : Returns the arcsine of num Math.atan(num) : Returns the arctangent value of num Math.atan2(y,x) : returns the inverse tangent of the quotient of y divided by x Math.ceil(num) : Returns the smallest integer greater than num Math.cos(num) : Returns the cosine of num 8. Math.exp(x) : Returns a number to the power x with a natural number as its base Math.floor(num) : Returns the largest integer less than num 10.Math.log(num) : Returns the natural log of num 11.Math.max(num1,num2) : returns the larger of num1 and num2 Math.min(num1,num2) : Returns the smaller of num1 and num2 Math.pow(x,y) : Returns the value of x to the y power Math.random() : Returns 1 random number between 0 and 1 15. Math. round(num) : Returns the value of num4 rounded into 5 Math.sin(num) : Returns the sine of num Math.sqrt(num) : Returns the square root of num Math.tan(num) : Returns the tangent of num 19.Math.E: Natural Numbers (2.718281828459045) Natural logarithm of Math 2:2 (0.6931471805599453) 21.Math.LN10: Natural logarithm of 10 (2.302585092994046) 22. Math. LOG2E: log 2 at the bottom of natural Numbers (1.4426950408889634) 23. Math. LOG10E: log 10 at the bottom of natural Numbers (0.4342944819032518) 24. Math. PI: PI (3.141592653589793) Math 1_2: square root of 1/2 (0.7071067811865476) Math.SQRT2: Square root of 2 (1.4142135623730951)
This is the end of this article, I hope you enjoy it.