取消覆盖 JavaScript function

Question

I made UserScripts, and am now stuck.

Inside of my HTML there is a script tag, and inside the script tag there is the following:

<script>
   setTimeout = function(){}
</script>

There is no way to use the function, its useless.

How can I solve this?

I was thinking using a way to set the function like main = setTimeout() and I can reset it after the script is loaded. Back to like setTimeout = main .

I am also trying to stay (mostly) undetected unlike running all of the code in a different environment like an iframe. I know you can just use setInterval and then break the loop, but this is just an example.

Answer 1

Run your userscript before the page has a chance to overwrite it. Use // @run-at document-start in the metadata block (combined with instant script injection in the Advanced section of Tampermonkey's config), and then you could do, in your userscript:

const origSetTimeout = window.setTimeout;
// proceed with your script, referencing origSetTimeout

which will continue to work even after the page loads and has overwritten the original setTimeout . (While you could reassign window.setTimeout back to the original one later, that would be detectable - if that's really a concern.)

The variables declared in the userscript, even at the top level, will not leak out into the page scope, so don't worry about origSetTimeout being exposed - though other actions done in the userscript could be detected.