This method returns a string representing the number object to the specified precision.
Its syntax is as follows −
number.toPrecision( [ precision ] )
precision − An integer specifying the number of significant digits.
Returns a string representing a Number object in fixed-point or exponential notation rounded toprecision significant digits.
Try the following example.
<html> <head> <title>JavaScript toPrecision() Method </title> </head> <body> <script type="text/javascript"> var num = new Number(7.123456); document.write("num.toPrecision() is " + num.toPrecision()); document.write("<br />"); document.write("num.toPrecision(4) is " + num.toPrecision(4)); document.write("<br />"); document.write("num.toPrecision(2) is " + num.toPrecision(2)); document.write("<br />"); document.write("num.toPrecision(1) is " + num.toPrecision(1)); </script> </body> </html>
num.toPrecision() is 7.123456 num.toPrecision(4) is 7.123 num.toPrecision(2) is 7.1 num.toPrecision(1) is 7