![]() ![]() Sometimes, you just want a code playground where you can test some code, or try out new JavaScript features you're not familiar with. # Run arbitrary JavaScript that's not related to the page So "Hello, Console!" must be the result of evaluating document.getElementById('hello').textContent = 'Hello, Console!'. After evaluating your code, a REPL prints the result of the expression. Recall the 4 steps of REPL: read, evaluate, print, loop. How the Console looks after evaluating the expression above.īelow the code that you evaluated you see "Hello, Console!". Notice how the text inside the button changes.įigure 3. Type document.getElementById('hello').textContent = 'Hello, Console!' in the Console and then press Enter to evaluate the expression. When building or debugging a page, it's often useful to run statements in the Console in order to change how the page looks or runs. # View and change the page's JavaScript or DOM This tutorial on the left, and DevTools on the right. Press Command+Option+J (Mac) or Control+Shift+J (Windows, Linux, ChromeOS) to open the Console, right here on this very page.įigure 2. When you physically follow along, you're more likely to remember the workflows later. This tutorial is designed so that you can open up the demo and try all the workflows yourself. It reads the JavaScript that you type into it, evaluates your code, prints out the result of your expression, and then loops back to the first step. The Console is a REPL, which stands for Read, Evaluate, Print, and Loop. See Get Started With Debugging JavaScript to learn how to pause JavaScript code and step through it one line at a time. See Get Started With Logging Messages to learn how to log messages to the Console. JS Graphics JS Graphics JS Canvas JS Plotly JS Chart.js JS Google Chart JS D3.This interactive tutorial shows you how to run JavaScript in the Chrome DevTools Console. JS vs jQuery jQuery Selectors jQuery HTML jQuery CSS jQuery DOM JS JSON JSON Intro JSON Syntax JSON vs XML JSON Data Types JSON Parse JSON Stringify JSON Objects JSON Arrays JSON Server JSON PHP JSON HTML JSON JSONP JS AJAX AJAX Intro AJAX XMLHttp AJAX Request AJAX Response AJAX XML File AJAX PHP AJAX ASP AJAX Database AJAX Applications AJAX Examples JS Web APIs Web API Intro Web Forms API Web History API Web Storage API Web Worker API Web Fetch API Web Geolocation API JS Browser BOM JS Window JS Screen JS Location JS History JS Navigator JS Popup Alert JS Timing JS Cookies JS HTML DOM DOM Intro DOM Methods DOM Document DOM Elements DOM HTML DOM Forms DOM CSS DOM Animations DOM Events DOM Event Listener DOM Navigation DOM Nodes DOM Collections DOM Node Lists JS Async JS Callbacks JS Asynchronous JS Promises JS Async/Await JS Classes Class Intro Class Inheritance Class Static JS Functions Function Definitions Function Parameters Function Invocation Function Call Function Apply Function Bind Function Closures JS Objects Object Definitions Object Properties Object Methods Object Display Object Accessors Object Constructors Object Prototypes Object Iterables Object Sets Object Maps Object Reference JS Tutorial JS HOME JS Introduction JS Where To JS Output JS Statements JS Syntax JS Comments JS Variables JS Let JS Const JS Operators JS Arithmetic JS Assignment JS Data Types JS Functions JS Objects JS Events JS Strings JS String Methods JS String Search JS String Templates JS Numbers JS BigInt JS Number Methods JS Number Properties JS Arrays JS Array Methods JS Array Sort JS Array Iteration JS Array Const JS Dates JS Date Formats JS Date Get Methods JS Date Set Methods JS Math JS Random JS Booleans JS Comparisons JS If Else JS Switch JS Loop For JS Loop For In JS Loop For Of JS Loop While JS Break JS Iterables JS Sets JS Maps JS Typeof JS Type Conversion JS Bitwise JS RegExp JS Precedence JS Errors JS Scope JS Hoisting JS Strict Mode JS this Keyword JS Arrow Function JS Classes JS Modules JS JSON JS Debugging JS Style Guide JS Best Practices JS Mistakes JS Performance JS Reserved Words ![]()
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