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JavaScript FAQ

Answers to Questions about...
Troubleshooting JavaScript/JScript

3. What are the most common scripting mistakes?

In his excellent JavaScript Sourcebook, in a section that begins, "We're only human, after all, and making misteaks is part of our nature," Gordon McComb identifies eleven common JavaScript gaffs:

  • Omitting quotation marks in Strings
  • Mismatched quotation mark types (' and ")
  • Omitting quotation marks when comparing strings
  • Confusing '=' (assign) and '==' (compare)
  • Improperly nested blocks in IF-THEN-ELSE statements
  • Trying to write to the script document
  • Trying to access forms as a property of a window rather than a document
  • Using String methods with the wrong objects
  • Endless loops lock up the browser
  • Missing or mismatched '{' or '}' around blocks
  • Omitting the return() statement in a function

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