如何使Greasemonkey在页面上的“其他"之前运行? [英] How does one have Greasemonkey run before *anything* else in the page?
问题描述
是否可以在页面上的其他之前运行Greasemonkey脚本?
Is it possible to have Greasemonkey scripts run before anything else on the page?
我知道@run-at document-start，但这似乎在<HTML>标记后立即运行.通常这不是问题，但是如果页面格式错误(如以下示例所示)，则似乎无能为力.
I'm aware of @run-at document-start, but this appears to run immediately after the <HTML> tag. Normally this isn't a problem, but if the page is misformatted as in the example below, there doesn't seem to be anything I can do.
我将不胜感激任何建议或想法. 谢谢！
I'd appreciate any suggestions or ideas. Thanks!
<script>alert('This is an annoying message.');</script>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
...etc...
推荐答案
这是不可能的，因为HTML要求脚本是在解析过程中执行或根本不执行，例如这是允许的:
It's not possible, because HTML requres that scripts are executed during parsing or not at all, e.g. this is allowed:
<script> document.write('<!'+'--'); </script>
如果浏览器不执行该脚本而经过该脚本，它将看到完全不同的文档，因此您无法在脚本运行之前分析HTML文档的DOM.
If browser goes past this script without executing it, it will see completely different document, therefore you can't analyze DOM of HTML document before scripts run.
Opera通过触发BeforeScript事件来解决 UserJS 中的问题，允许UserJS在最后一刻更改/删除脚本.
Opera solves this problem in UserJS by firing BeforeScript events, allowing UserJS to change/remove scripts at the very last moment.
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