What's the difference between 'javascript(0)' and 'javascript(1)'?

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Grade: Education Subject: Support
What's the difference between 'javascript(0)' and 'javascript(1)'?
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The first 'javascript(0)' attempts to call a function that doesn't exist. The second 'javascript(1)' attempts to call a function that *does* exist, providing a more specific and correct way to access the functionality.