First of all, JavaScript has nothing to do with the Java programming language. JavaScript is a scripting language based on the browser that executes the code on the client side. This means that any code that is written in JavaScript is delivered from the server next to the web pages, and all the code is executed from the user’s browser (on the user’s device) rather than directly on the server where it is located. the website.
There are situations in which JavaScript is an excellent solution to develop interesting features on your website, but there are also situations where the use of JavaScript can damage the performance of your website. Next we will see some advantages and disadvantages of this powerful tool.
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The advantages
JavaScript is an excellent solution to implement the data validation of a form on the client side. If a user fails to write their name on a form, a validation function in JavaScript can display a popup message on the screen to let the user know about the omission. This type of functionality is more advantageous than having a server-side validation routine to control the error, since the server in this case does not have to do any additional information processing. An ASP or PHP routine could be written to accomplish the same task but a form developed in JavaScript would not allow the information to be sent unless the form is completed correctly.
One of the areas in which JavaScript stands out radically is the creation of dynamic effects such as dynamic images and slide shows, where their use has become commonplace today. Because JavaScript runs inside the client’s browser, it can be used to change the appearance of the screen on the user’s device after the page has been sent by the server. This allows the web developer to create very impressive dynamic effects thus improving the experience that a user receives when entering a website.
The disadvantages
Security is still the Achilles heel of Javascript. Once the JavaScript code snippets are added to the web pages on the servers, they are downloaded and executed in the client’s browser, allowing certain malicious code to be executed on the client’s machine in order to exploit a security vulnerability known in one of the applications, browsers or the same operating system. It is true that today there are security standards that restrict the execution of code by browsers, but even so, you can execute code that damages, steals or destroys information on the client side.
Another disadvantage of JavaScript is that it tends to introduce a huge amount of code snippets on our websites. Luckily, the problem of large pieces of JavaScript code is easily solved by storing the JavaScript code within separate files of the HTML code with the extension. * .Js, leaving a much cleaner and readable website for the developer.
Due to the tendency of JavaScript to increase the code of web pages, it is necessary to organize the JavaScript code into separate files to HTML code so that search engines (Google) can easily decipher the quality of the content of the web page and this can be indexed correctly in search results.
When a search engine reaches a website looking for quality content along with the keywords to determine how useful the page is, the last thing a search engine wants to find are hundreds of lines of JavaScript code. Again, this problem is easily solved by storing the JavaScript code in script files with the extension * .Js.
