Following are the Advantages of javaScript over external :-

• Reusability of code.
• Easy code readability.
• It Enables both web designers and coders to work with html and js files.
• With these small js files, you can use Google closure or YUI Compressor or other minifying tools to reduce the size and make it not readable by humans .

Disadvantages :

Following are the disadvantages of javaScript over external :-

• Code can be downloaded using the url of the js file. This can help coders to steal your code easily.
• If two js files are dependent on one another, then a failure in one file may affect the execution of the other dependent file.
• A small change to a common js file may cause unexpected results in some of the HTML files .
• The browser has to make an extra http request to get the js code.

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