External JavaScript Advantages

Placing JavaScripts in external files has some advantages:
  • It separates HTML and code
  • It makes HTML and JavaScript easier to read and maintain
  • Cached JavaScript files can speed up page loads
  • External scripts are practical when the same code is used in many different web pages.

JavaScript Display Possibilities

JavaScript can "display" data in different ways:
  • Writing into an alert box, using window.alert().
  • Writing into the HTML output using document.write().
  • Writing into an HTML element, using innerHTML.
  • Writing into the browser console, using console.log().

Note:- It is a good idea to place scripts at the bottom of the <body> element.
This can improve page load, because script compilation can slow down the display.

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