JavaScript has a lot of code and a lot of rules. For various reasons, we may make unexpected errors in the process of writing code. At such a time, we must learn how to correct these errors. Find them and correct them. JavaScript also has special error-finding codes. These codes will allow us to find errors faster.

1. Error message. If our coding cannot be performed effectively during execution, Java can give a message prompt under specific circumstances to let us know that there is wrong code in this program.

2. Special detection code. There is also a special detection code in Java. This code will detect the program on the web page. If there is an erroneous code, it will be prompted through this detection statement. This is the role of try and catch appearing in pairs in the code.

3. A basic use case of detection code try and catch.

4.Throw statement. This statement is specifically used to prompt errors. It can also be used to detect the execution results of java functions. It can be used together with the catch statement.

5. A code example of using multiple error detection statements together.

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