How to detect if URL has changed after hash in JavaScript

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How can I check if a URL has changed in JavaScript? For example, websites like GitHub, which use AJAX, will append page information after a # symbol to create a unique URL without reloading the page. What is the best way to detect if this URL changes?

  • Is the onload event called again?
  • Is there an event handler for the URL?
  • Or must the URL be checked every second to detect a change?

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