Greasemonkey script to remove HTML between specific comments?

问题

In order to block some JavaScript that I don't want to execute when I load a page, I would like to have a Greasemonkey script that deletes everything between two HTML comment tags. For example:

<!-- sub script -->
 Lines containing script elements to be removed
<!-- end sub script -->

I have previously tried removing the script elements using a sample script that was suggested to me, but it isn't working as expected. That script was this:

var script = document.querySelectorAll('script[src*="example.com"]');
for (var i = 0, len = script.length; i < len; i++) {
   script[i].parentNode.removeChild(scriptscript[i]);
}

Simply put, it doesn't remove the script elements as I had hoped it would. I know that the comment elements are consistent between pages and if I could use those as the markers to begin and end a search and simply delete everything in between, I believe it would solve the problem.

Any guidance would be appreciated. To say I'm new to JavaScript would be an understatement, but I'm a quick learner.

回答1:

You can't remove a JavaScript script by just removing the <script> which included it.

That's because once browser parses the <script>, the script runs, and there's no way to undo that.

But on some browsers you can block the script just before it runs, using beforescriptexecute event:

window.addEventListener('beforescriptexecute', function(e) {
    if (~e.target.src.indexOf('example.com')) {
        e.preventDefault();
    }
}, true);

Note your GM script must run before the script you want to block, to be sure, use

@run-at document-start

来源：https://stackoverflow.com/questions/23413400/greasemonkey-script-to-remove-html-between-specific-comments

标签

javascript

html

greasemonkey