Answers for "use js function in html"

how to use js in html

<script>
  function alert () {
    alert("Javascript has started");
  }
</script>

how to use javascript in html

<!-- If JS is in external file: -->
<script src="filename.js" charset="utf-8"></script>

<!-- If you want JS in the your HTML file -->
<script>
  /*Your JS Code Here*/
</script>