The method of JavaScript debugging

This article mainly introduces the relevant knowledge of "methods of JavaScript debugging". The editor shows you the operation process through actual cases. The operation method is simple, fast and practical. I hope this article "methods of JavaScript debugging" can help you solve the problem.

JavaScript debugging

When writing JavaScript, it can be painful without a debugging tool.

JavaScript debugging

It is difficult to write JavaScript programs without debugging tools.

Your code may contain syntax errors, logic errors, which can be difficult to find without debugging tools.

Usually, if there is an error in JavaScript, there will be no prompt, so you can't find the location of the code error.

Tip: usually, errors occur when you write a new JavaScript code.

JavaScript debugging tool

Looking for errors in program code is called code debugging.

Debugging is difficult, but fortunately, many browsers have built-in debugging tools.

Built-in debugging tools can be turned on or off, and serious error messages are sent to the user.

With debugging tools, we can set breakpoints (where the code stops executing) and detect variables as the code executes.

The browser generally enables debugging tools by pressing the F12 key and selecting "Console" from the debug menu.

Console.log () method

If the browser supports debugging, you can use the console.log () method to print JavaScript values on the debug window:

Example

Axi5

Baked 6

C=a+b

Console.log (c)

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