How to find bugs in javascript

JavaScript is a widely used programming language used to build modern web applications. As JavaScript becomes more complex and more widely used, debugging bugs becomes increasingly important. This article will introduce some tips and tools for debugging and finding bugs in JavaScript.

1. Use browser developer tools
   Modern browsers usually come with their own developer tools, which provide rich debugging capabilities. The most commonly used one is the console. When JavaScript code is executed, Console will record the information printed in the code, such as the content output by console.log. In addition, most browsers' developer tools include debugger capabilities that can stop code execution while it is executing and examine variables, functions, and call stacks.
2. Manual debugging
   Manual debugging is a good choice when using developer tools cannot solve the problem. There are many methods for manual debugging. The most basic one is to add a console.log statement to the code to output the value of the variable. Although this method is a bit cumbersome, it can still be very useful when other debugging tools fail to solve the problem.
3. Use breakpoint debugging
   Breakpoint debugging is a very powerful debugging method. Unlike manual debugging, you can set breakpoints in your code and then automatically stop execution when the code reaches that breakpoint. At this time you can check a series of information such as variable values ​​and call stacks. The developer tools of most modern browsers provide breakpoint debugging capabilities.
4. Using ESLint
   ESLint is a plug-in static code analysis tool that can help you comply with best practices and standards for JavaScript code. It checks your code for common errors and provides suggestions for optimizing your code, such as removing unused variables, using proper indentation, and normalizing syntax. Using ESlint can help you find some hard-to-find errors and improve code quality.
5. Use other debugging tools
   In addition to the above methods, there are many other debugging tools and techniques to choose from. For example:
6. Benchmarking tools: help you compare and optimize the performance of your code.
7. Call tracing tool: Helps you find function calls in your code.
8. Unit testing tools: Help you find problems in your code and ensure that the code functions correctly.

Although the above methods are useful, there are still many common bugs in JavaScript, such as asynchronous code problems, type errors, etc. Therefore, it is also important to understand common bugs and learn how to prevent them. When writing code, you should keep it concise, unambiguous, and easy to debug, and use modern web development best practices where possible.

In short, bug debugging in JavaScript is a process of continuous learning and improvement. Understanding existing debugging tools and techniques will help you identify problems and resolve them faster.

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