By which we can change our page or block background color. There’s a lot going on in the example above, so let’s look at each part individually. Before we use a function, we need to define it. function is the keyword that starts declaring a function. Or in C, you follow the rules defined for Doxygen (Doxygen also supports other programming languages such as Objective-C, Java, C#, PHP, etc. jQuery detects this state of readiness for you. We have shown you step by step all code with the example that how to use script and change background. If you know something about Python you probably document your code following the rules defined for Sphinx (Sphinx uses reStructuredText as its markup language). Functions are very important and useful in any programming language as they make the code reusable A function is a block of code which will be executed only if it is called. need to have documentation headers, or they will not be recognized by the parser (unlike the API module, which picks up all PHP items whether or not they have documentation headers). The function is named as Say_Hello() which will simply print a salute. This section explains how to write your own functions in JavaScript. Use JSRuntimeExtensions.InvokeVoidAsync for the following: JavaScript functions that return void(0)/void 0 or undefined. function documentation. JavaScript allows us to write our own functions as well. On the above JavaScript with button example as shown we write down our own JavaScript function with the name of showOutput(message) in HEAD section of an HTML file, it is better to use always follow the same convention mean write your all the JavaScript in HEAD instead of BODY. The string stored in name is incorporated into a welcome message, which is passed to a JavaScript function, displayWelcome, which renders the welcome message into a heading tag. Call Function with onClick() We will start with a very popular example where we will call an already defined function with the onClick() event. Our addTwoNumbers() function above, for example, is fully described by the JSDoc heading. (x, y) are parameters, variable names for the inputs a function will accept. All JavaScript items (methods, object constructors and properties, functions, variables, etc.) @param tag provides parameters for a javascript function. So JavaScript has its own functions and syntax. Someone that knows something about Java probably knows about JavaDoc. ; addTwoNumbers is the function’s name, which is customizable — just like variable names. Adding additional info inside the function. If you have a few l JavaScript Define & Call Functions with Example ). Call a void JavaScript function. But for slightly bigger functions, it’s useful to add one-line (or sometimes multi-line) comments within to describe what’s happening. Code included inside $( document ).ready() will only run once the page Document Object Model (DOM) is ready for JavaScript code to execute. The major difference between a real-life ask and the example above is that real-life functions use more complex ways to interact with the user than a simple confirm.In the browser, such function usually draws a nice-looking question window. In practice, such functions are quite useful. In my previous post, we learned javascript documentation framework - JSDOC tutorials, In this post, We are going to learn JSdoc function tags with examples. `SCRIPT` is a JavaScript code which can be a single or multiple statements or a function call. I use JSDoc for the main function overview, and sometimes that’s enough. A page can't be manipulated safely until the document is "ready." Function Definition. 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