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<body>

<p>The toExponential() method returns a string, with the number rounded and written using exponential notation.</p>

<p>An optional parameter defines the number of digits behind the decimal point.</p>

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

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

</body>
</html>