1. Scope issues: JavaScript variables have function scope, which means that a variable declared inside a function is only accessible within that function. This can lead to confusion and unexpected behavior when variables are accessed from the wrong scope.
2. Hoisting: JavaScript hoists variable and function declarations to the top of the scope, which can lead to unexpected behavior when a variable or function is accessed before it is declared.
3. Closure: JavaScript closures can be a powerful tool, but they can also be a source of confusion and unexpected behavior if not used correctly. Closures can cause memory leaks if they are not properly cleaned up.
4. Asynchronous code: JavaScript is single-threaded, but it uses callbacks and promises to handle asynchronous code, which can lead to confusion and unexpected behavior when dealing with asynchronous code.
5. Type coercion: JavaScript is a loosely typed language, which can lead to unexpected behavior when comparing values of different types.
6. Prototype chain: JavaScript uses a prototype chain for inheritance, which can be a source of confusion and unexpected behavior if not used correctly.
7. Event handling: JavaScript’s event-driven nature can lead to confusion and unexpected behavior when dealing with events and event handlers.
8. Cross-browser compatibility: Different browsers have different implementations of JavaScript, which can lead to compatibility issues and the need for browser-specific code.
9. Performance issues: JavaScript’s dynamic nature and the use of closures and prototypes can lead to performance issues, such as slow execution times and memory leaks.
10. Security issues: JavaScript is a client-side language, which can make it vulnerable to attacks such as cross-site scripting (XSS) and cross-site request forgery (CSRF) if not properly secured.

It’s important to keep in mind that JavaScript is a powerful, but also a tricky language. Being aware of these common issues can help you avoid them and write more efficient, secure and maintainable code.