Greasemonkey：停止嵌入式 JS 运行

发布于 2024-09-09 08:53:32 字数 488 浏览 3 评论 0原文

页面的 html 中包含以下内容：

<script type="text/javascript">
  // some code
</script>

我的greasemonkey 脚本需要阻止该脚本运行。我该怎么做？

更新：我知道在一般情况下这是不可能的。但是，在我的具体情况下，我可能有漏洞？

<script type="text/javascript">
  if (!window.devicePixelRatio) {
    // some code that I -don't- want to be run, regardless of the browser
  }
</script>

有什么方法可以在嵌入脚本运行之前定义 window.devicePixelRatio 吗？

原文

A page has the following in the html:

<script type="text/javascript">
  // some code
</script>

My greasemonkey script needs to prevent that script from running. How can I do this?

Update: I understand that in the general case this is impossible. However, in my specific case, I may have a loophole?

<script type="text/javascript">
  if (!window.devicePixelRatio) {
    // some code that I -don't- want to be run, regardless of the browser
  }
</script>

Is there some way I can define window.devicePixelRatio before the embedded script runs?

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心碎的声音 2024-09-16 08:53:32

现在可以通过 @run-at document-start 和 Firefox 的 beforescriptexecute。仅在 FF24 中测试。

// ==UserScript==
...
// @run-at         document-start
// ==/UserScript==

//a search string to uniquely identify the script
//for example, an anti-adblock script
var re = /adblock/i;

window.addEventListener('beforescriptexecute', function(e) {

    if(re.test(e.target.text)){

        e.stopPropagation();
        e.preventDefault();
    }

}, true);

beforescriptexecute 在 2016 年被 HTML 5 拒绝，并且< a href="https://www.chromestatus.com/feature/5711871906676736" rel="nofollow noreferrer">Chrome 不太可能实现它。

它不会针对其他脚本插入的

This is now possible with @run-at document-start and Firefox's beforescriptexecute. Tested only in FF24.

// ==UserScript==
...
// @run-at         document-start
// ==/UserScript==

//a search string to uniquely identify the script
//for example, an anti-adblock script
var re = /adblock/i;

window.addEventListener('beforescriptexecute', function(e) {

    if(re.test(e.target.text)){

        e.stopPropagation();
        e.preventDefault();
    }

}, true);

beforescriptexecute was rejected for HTML 5 in 2016, and Chrome is unlikely to implement it.

It does not run for <script> nodes inserted by other scripts.

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星星的軌跡 2024-09-16 08:53:32

关于：

有什么方法可以在嵌入脚本运行之前定义window.devicePixelRatio吗？

现在有了。就像这样：

// ==UserScript==
// @name     _Pre set devicePixelRatio
// @include  http://YOUR_SERVER.COM/YOUR_PATH/*
// @run-at   document-start
// @grant    none
// ==/UserScript==
//-- @grant none is imporatant in this case.

window.devicePixelRatio = "Unimportant string or function or whatever";

一般情况：

从 Firefox 版本 4 开始，现在只能在 Firefox 上实现这一点。使用checkForBadJavascripts实用程序来利用beforescriptexecute.像这样：

// ==UserScript==
// @name     _Block select inline JS
// @include  http://YOUR_SERVER.COM/YOUR_PATH/*
// @require  https://gist.github.com/raw/2620135/checkForBadJavascripts.js
// @run-at   document-start
// @grant    GM_addStyle
// ==/UserScript==
/*- The @grant directive is needed to work around a design change
    introduced in GM 1.0.   It restores the sandbox.
*/

checkForBadJavascripts ( [
    [false, /window\.devicePixelRatio/, null]
] );

这会阻止第一个内联脚本，其中包含window.devicePixelRatio，完全。如果您想有选择地修改该脚本的部分内容，请参阅此答案和/或这个答案。

Re:

Is there some way I can define window.devicePixelRatio before the embedded script runs?

There is now. Like so:

// ==UserScript==
// @name     _Pre set devicePixelRatio
// @include  http://YOUR_SERVER.COM/YOUR_PATH/*
// @run-at   document-start
// @grant    none
// ==/UserScript==
//-- @grant none is imporatant in this case.

window.devicePixelRatio = "Unimportant string or function or whatever";

In the general case:

Since Firefox version 4, this is now possible on Firefox only. Use the checkForBadJavascripts utility to leverage the power of beforescriptexecute. Like so:

// ==UserScript==
// @name     _Block select inline JS
// @include  http://YOUR_SERVER.COM/YOUR_PATH/*
// @require  https://gist.github.com/raw/2620135/checkForBadJavascripts.js
// @run-at   document-start
// @grant    GM_addStyle
// ==/UserScript==
/*- The @grant directive is needed to work around a design change
    introduced in GM 1.0.   It restores the sandbox.
*/

checkForBadJavascripts ( [
    [false, /window\.devicePixelRatio/, null]
] );

This blocks the first inline script, that contains window.devicePixelRatio, entirely. If you want to selective modify parts of that script, see this answer and/or this answer.

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