SyntaxError:有效javascript上的意外标记'<‘

SyntaxError: Invalid or unexpected token '<' in valid JavaScript code refers to a situation where an unexpected character '<' is encountered. This error typically occurs when trying to execute HTML code or XML code within a JavaScript file, or when there is a syntax error in the JavaScript code itself.

To resolve this issue, you should carefully check your JavaScript code for any syntax errors and make sure that it does not contain HTML or XML code. Here are some steps to help you debug and fix this error:

1. Check for syntax errors: Review your JavaScript code to ensure that all parentheses, brackets, and braces are properly closed. Check for missing or extra characters, incorrect variable assignments, or incorrect function declarations.
2. Verify code execution context: Ensure that the JavaScript code is being executed in the correct context. If you are trying to run JavaScript within an HTML file, make sure that it is enclosed in script tags and placed in the appropriate location within the HTML structure.
3. Separate HTML and JavaScript: Avoid mixing HTML code and JavaScript code within the same file, as it can lead to syntax errors. Instead, separate them into distinct files or use event listeners to execute JavaScript code on specific HTML elements.
4. Escape special characters: If you need to include HTML or XML snippets within your JavaScript code, make sure to properly escape special characters such as '<', '>', and '&'. For example, use '<' instead of '<' to represent the less than sign.

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