JavaScript Number toExponential() method

Definition and usage

toExponential() The method converts a number to exponential notation.

Instance

Example 1

let num = 5.56789;
let n = num.toExponential(3);

Try it yourself

Example 2

Convert a number to exponential notation:

let num = 5.56789;
let n = num.toExponential();

Try it yourself

Syntax

number.toExponential(digits)

Parameter

Parameter description
digits

Optional. An integer between 0 and 20, specifying the number of decimal places in exponential notation.

If omitted, it is set to the number of digits required to represent the value.

return value

type description
string represent the number in exponential notation.

Technical details

return value

Returns the string representation of Number using exponential notation, that is, one digit before the decimal point and digits digit. The decimal part of the number will be rounded and, if necessary, padded with 0 to reach the specified length.

thrown

exception description
RangeError

when digits An exception is thrown when the value is too small or too large. Values between 0 and 20 do not cause this exception.

Some implementations support a wider or narrower range of values.
TypeError An exception is thrown if the object that calls this method is not a Number.

Browser support

Number.constructor Er ECMAScript3 (ES3) funktioner.

Alle browsere understøtter ES3 (JavaScript 1999):

Chrome IE Edge Firefox Safari Opera
Chrome IE Edge Firefox Safari Opera
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