javascript how to include a javascript file code example

Example 1: include other js files in a js file

document.writeln("<script type='text/javascript' src='Script1.js'></script>");
document.writeln("<script type='text/javascript' src='Script2.js'></script>");

Example 2: how to write code in external javascript file

function myFunction() {

  document.getElementById("demo").innerHTML = "Paragraph changed.";

}