Examples of js rounding mathematical functions round

The round Function in js can be used to round a number. It calculates the first digit after the decimal point.
The round function can be used to round the number. It is a rounding function. Let's look at the round Syntax:
Copy codeThe Code is as follows:
Math. round (number)

Below are several examples:
Copy codeThe Code is as follows:
Document. write (Math. round (2.65); // print 3
Document. write (Math. round (7.05); // print 7
Documents. write (Math. round (-2.65); // print-3
Document. write (Math. round (-8.15); // print-8
Document. write (Math. round (11.65); // print 12

The rounding of the round function is only for the first digit after the decimal point. If you want to target other digits after the decimal point, We can first multiply the number by an integer multiple of 10, and then divide it by the same number:
Copy codeThe Code is as follows:
Var my_val = 11.257;
Var my_val = 11.254;
Document. write (Math. round (my_val * 100)/100 );
// Print 11.25