[PDF] Erreurs JavaScript (bogues) : - Javascript

What is a Javascript error?

Each error is an object based upon the Error object, and has a name and a message. Errors displayed in the Web console may include a link to the corresponding page below to help you quickly comprehend the problem in your code. For a beginner's introductory tutorial on fixing JavaScript errors, see What went wrong? Troubleshooting JavaScript.

What are error properties in JavaScript?

By default, errors in JavaScript contain three properties: name: The type of error that occurred (We’ll dive deep into this in the next section) stack: The stack trace of the code executed when the error occurred. Additionally, errors can also carry properties like columnNumber, lineNumber, fileName, etc., to describe the error better.

How do I find a Javascript error message?

What's even more useful is that the console gives you error messages whenever a syntax error exists inside the JavaScript being fed into the browser's JavaScript engine. Now let's go hunting. Go to the tab that you've got number-game-errors.html open in, and open your JavaScript console. You should see an error message along the following lines:

Why does JavaScript not work if I try it out?

But when you try it out, even with the try statement, it still does not work. This is because there are two main types of errors in JavaScript (what I described above –syntaxError and so on – are not really types of errors. You can call them examples of errors): parse-time errors and runtime errors or exceptions.