Detect if console/devtools is open in all browsers

问题

I'm trying to create a script which will run when any browser console is opened or closed. Is there any way to detect if the browser console in all browsers (Firefox/IE/Chrome/Safari/Opera) is open or not via JavaScript, jQuery, or any other client-side script?

回答1:

If you are willing to accept an interference for the user, you could use the debugger statement, as it is available in all major browsers.

Side note: If the users of your app are interested in console usage, they're probably familiar with dev tools, and will not be surprised by it showing up.

In short, the statement is acting as a breakpoint, and will affect the UI only if the browser's development tools is on.

Here's an example test:

<body>
<p>Devtools is <span id='test'>off</span></p>
<script>
  var minimalUserResponseInMiliseconds = 100;
  var before = new Date().getTime();
  debugger;
  var after = new Date().getTime();
  if (after - before > minimalUserResponseInMiliseconds) { // user had to resume the script manually via opened dev tools 
    document.getElementById('test').innerHTML = 'on';
  }
</script>

</body>

回答2:

I don't think it is directly possible in JS for security reasons.But in here they are claiming that it is possible and is useful for when you want something special to happen when DevTools is open. Like pausing canvas, adding style debug info, etc.

But As @James Hill tell in this, I also thinks even if a browser chose to make this information accessible to the client, it would not be a standard implementation (supported across multiple browsers). Also can also try this one also here.

回答3:

It's not possible in any official cross browser way, but if the occasional false positive is acceptable, you can check for a window.onresize event. Users resizing their windows after loading a page is somewhat uncommon. It's even more effective if you expect users will be frequently opening the console, meaning less false positives as a percentage. This will fail to detect if the console is already open when the user visits the page, or if the user opens the console in a new window.

window.onresize = function(){
    if ((window.outerHeight - window.innerHeight) > 100) {
        // console was opened (or screen was resized)
    }
}

Credit to https://stackoverflow.com/a/7809413/3774582. Although that question is chrome specific, the concept applies here.

To expand on this, if you need a very low tolerance on false positives, most window resizes will trigger this event dozens of times because it is usually done as a drag action, while opening the console will only trigger this once. If you can detect this, the approach will become even more accurate.

回答4:

I haven't tried devtools-detect in-depth but the demo looks promising...

devtools-detect

→ detect whether DevTools is open, and its orientation.

Supported Browsers:

Chrome DevTools

Safari DevTools

Firefox DevTools

Opera DevTools

Caveats:

Doesn't work if DevTools is undocked and will show false positive if you toggle any kind of sidebar.

Try the simple demo page.

来源：https://stackoverflow.com/questions/40153206/detect-if-console-devtools-is-open-in-all-browsers

标签

javascript

jquery

browser

cross-browser