javascript - Why isn't document.evaluate working? -

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I'm using it in the Firefox extension and can not get it to work. 

  all allLinks = document.evaluate ('// one [@ auf]', window.document, null, XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE, empty); Window.alert (allLinks);

This alert [Object XPathResult] . Although always gives 0 in the following (and of course there are links on the page). 

  window.alert (allLinks.snapshotLength);

If this Firefox is specific and I believe that you only use the new version Can you do this when the DOM is completely loaded?

to do this DOMContentLoaded or something else. 

  Documents. AddEventListener ('DOMContentLoaded', fn, false);

Edit: Your XP works for me Is it in the console on the current, loaded page, before anything is present you are inquiring .


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