JScript is a script-based programming language from Microsoft which offers (almost) the complete functional scope of an object-oriented programming paradigm. JScript is primarily used as a code component or as a complement of dynamic HTML documents to improve the user experience on websites.
Typical applications of JScript are dynamic HTML documents that are generated on the client side, if a website is accessed. JScript runs in the browser and not on the server. If a user, for example, puts an online store product in their cart, it is often implemented with JScript, so that the website does not have to be loaded again from the server. Forms, search boxes, dialog boxes or banners can be programmed with Jscript as well. Downloading of images and text or access to the source code of a website can be prevented.
JScript applies the sandboxed principle. The code is executed in a cage and is independent of the user’s operating system and the server on which the HTML documents are stored. Even if scripts are disabled in the browser, HTML documents are displayed. The reason for this is mainly security. The operating system should not be reachable through script applications. At the same time, the requests to the server are reduced by the sandbox principle, which affects server performance positively.
Script errors should be avoided so that no bugs arise which could have a negative impact on search engine optimization.