how to add javascript in html

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

1 <script type="text/javascript" 
2         src="file.js">  
3</script>  

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

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

1<script>
2  //put your java script here
3  </script>

1$(document).ready(function() {
2  // add your code here
3})
4