Where to debug javascript

JavaScript is a powerful programming language that has been widely used in web development and front-end technologies. However, during the development process, we often encounter errors in JavaScript code, which requires us to debug and find the problematic code. Well, in this article, we will discuss where to debug JavaScript to help developers solve problems better.

1. Browser Developer Tools

Browser Developer Tools is one of the most commonly used JavaScript debugging tools. Almost all modern web browsers provide their own developer tools, such as Google Chrome's developer tools, Firefox's developer tools, etc. In the console of the developer tools, we can see all JavaScript errors and warnings, and can also "step through" the code. Through the "single-step debugging" function, we can execute the code line by line and view the current variable values ​​​​and execution status on the console to check the source of the error.

In Google Chrome's developer tools, you can open the console by following these steps:

1. Open the Google Chrome browser.
2. Press F12 to enter the developer tools.
3. Select the "Console" tab and view the error message there.

Of course, the operation methods of developer tools of different browsers may be different, but the basic principles are similar.

2. Visual Studio Code

Visual Studio Code is a free code editor with a wide range of extensions and plug-ins, supporting multiple programming languages ​​and debugging capabilities. Its debugging function can help developers set breakpoints in the code, which can stop the code at a specific location during execution. We can activate the debugging mode of VS Code through F5, and then set breakpoints in the code to enter "single-step debugging" mode.

In VS Code, we can debug JavaScript code through the following steps:

1. Install the JavaScript Debug plug-in.
2. Open the code file and set breakpoints.
3. Press F5 to start the debugger and run the code.

During debugging, we can view the values ​​of variables, step through the code, and print information to the console for debugging.

3. Online debugging tools

In addition to the local development environment, there are many online tools that can help us debug JavaScript code. For example, JSFiddle is a popular online code editor that not only supports multiple languages ​​​​such as HTML, CSS, JavaScript, etc., but also supports "single-step debugging" and error message warnings.

To use JSFiddle for JavaScript debugging, you only need the following steps:

1. Open the JSFiddle website.
2. Select the corresponding language environment, including HTML, CSS, and JavaScript.
3. Write code and execute it for debugging.

In addition, there are some other online debugging tools, such as Online JS Editor and CodePen.

Summary

In this article, we discussed where to do JavaScript debugging. With a variety of options including browser developer tools, Visual Studio Code, Online debugging tools, and more, developers can quickly and easily debug their code and resolve errors and issues in their JavaScript code. Whether in a local development environment or online, we can use these tools to speed up troubleshooting JavaScript code.

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