how to use javascript in html

1// this how add javascript file in html !!
2
3
4<script type="text/javascript" src="yourJavascript.js"></script>

1<!-- include an external javascript document -->
2<script src="myJavaScript.js" charset="utf-8"></script>
3
4<!-- JavaScript inside html element -->
5<script>
6  console.log("This is JavaScript");
7</script>

1<script>
2  function alert () {
3    alert("Javascript has started");
4  }
5</script>

1<script src="script.js"></script>

1<!-- If JS is in external file: -->
2<script src="filename.js" charset="utf-8"></script>
3
4<!-- If you want JS in the your HTML file -->
5<script>
6  /*Your JS Code Here*/
7</script>

1<script>
2 document.getElementById("id").innerText = ("");
3</script>