JavaScript toFixed () method

Http://www.w3school.com.cn/jsref/jsref_tofixed.asp

JavaScript Number Object

Definition and usage

The ToFixed () method rounds numbers to a number that specifies the number of decimal digits.

Grammar

Numberobject.tofixed (num)

Parameters	Description
Num	Necessary. Specifies the number of decimal places, which are values between 0 and 20, including 0 and 20, and some implementations can support a larger range of values. If this argument is omitted, 0 will be used instead.

return value

Returns a string representation of numberobject, with no exponential notation, and a fixed num digit number after the decimal point. If necessary, the number is rounded, or it can be topped with 0 so that it reaches the specified length. If NUM is greater than le+21, the method only calls Numberobject.tostring () and returns the string represented by exponential notation.

Thrown

Throws an exception rangeerror when NUM is too small or too large. A value between 0 and 20 does not throw the exception. Some implementations support values in a larger range or a smaller range.

The TypeError exception is thrown when the object calling the method is not number.

Instance

In this example, we will round the number to a number with only one decimal:

Show the number 13.37 with one decimal:<script type= "text/javascript" >var num = new number (13.37);d Ocument.write (nu M.tofixed (1)) </script>

Output:

Show the number 13.37 with one decimal:13.4

Tiy

ToFixed ()

How to use toFixed () to round a number.

JavaScript Number Object

JavaScript toFixed () method