how to run javascript in html code example

Example 1: include script in html

<script type="text/javascript" src="/path/to/script.js"></script>

Example 2: hello world javascript

// Output Hello World! in the console.
console.log("Hello World!");

Example 3: javascript hello world

console.log("Hello World!");

Example 4: insert js in html

<script src=¨script.js¨></script>

Example 5: how to enter javascript in html

<script type="text/javascript">
  alert("This alert box was called with the onload event");
</script>