Try it Editor: JavaScript Number Methods 4

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<!DOCTYPE html>
<html>
<body>

<h2>JavaScript Number Methods</h2>

<p>The toPrecision() method returns a string, with a number written with a specified length:</p>

<p id="demo"></p>

<script>
var x = 9.656;
document.getElementById("demo").innerHTML = 
    x.toPrecision() + "<br>" +
    x.toPrecision(2) + "<br>" +
    x.toPrecision(4) + "<br>" +
    x.toPrecision(6);    
</script>

</body>
</html>

Result :