用Greasemonkey删除一个javascript函数 [英] Remove a javascript function with Greasemonkey

问题描述

我访问了一个HTML文件头部的JavaScript文件网站

 < script language =javascriptsrc = javscript.js >< /脚本> 
  

此文件中的代码为：

<$ （document.layers）document.captureEvents（Event.KEYPRESS）
函数更新（e）{
if（document）。所有）{//资源管理器
if（event.keyCode == 13）document.forms [0] .submit（）; // 13 = ENTER
else if（event.keyCode == 26）runHelp（hplk）; // 26 = CTRL + Z
return;
} else {// mozilla
if（e.which == 13）document.forms [0] .submit（）; // 13 = ENTER
else if（e.which == 26）runHelp（hplk）; // 122 = CTRL + Z
return;
}
}
document.onkeypress = update;

我想用Greasemonkey禁用/删除/替换这个函数。

我试过它用

  unsafeWindow.update = function（）{} 
 
 code> 

没有结果！ （在控制台中没有错误）

有没有办法杀死这个函数？

解决方案

目前还不清楚 update 是一个全局函数。如果不是，那么这种方法将无法正常工作。

但是您可以用下面的方式覆盖按键处理程序：

  unsafeWindow.document.onkeypress = function（）{}; 
  

---

---

对于一种通用的，高性能的方式来选择性地阻止或替换任何JS（在Firefox上），使用 @ run-at document-start 和

  // == UserScript = = 
 // @name _替换在页面上选择javascript 
 // @include http://YOUR_SERVER.COM/YOUR_PATH/* 
 // @require https：//gist.github。 com / raw / 2620135 / checkForBadJavascripts.js 
 // @ run-at document-start 
 // @grant GM_addStyle 
 // == / UserScript == 
 / *  - 需要使用@grant指令来解决GM 1.0中引入的设计更改
。它恢复沙箱。 
 * / 
 
 checkForBadJavascripts（[
 [false，
 /document\.onkeypress\s*=\s*update/，
函数（）{
 addJS_Node（myKeypressFunction.toString（））; 
 addJS_Node（'document.onkeypress = myKeypressFunction;'）; 
} 
] 
]）; 
 
 
函数myKeypressFunction（evt）{
 / *在此处不要使用GREASEMONKEY函数，而使用
函数。 
 * / 
 console.log（Keypress function fired。）; 
} 
  

---

查看此答案，获取有关 checkForBadJavascripts 。的更多信息。

I visit a website with a javascript file in the head of the HTML

<script language="javascript" src="javscript.js"></script>

The code inside this file is:

// keypress management 
if (document.layers) document.captureEvents(Event.KEYPRESS)
function update(e) {        
    if (document.all) {             // Explorer
        if (event.keyCode==13) document.forms[0].submit();  // 13 = ENTER
        else if (event.keyCode==26) runHelp(hplk);          // 26 = CTRL+Z
        return;
    } else {                                                // mozilla
        if (e.which==13) document.forms[0].submit();        // 13 = ENTER
        else if (e.which==26) runHelp(hplk);                // 122 = CTRL+Z     
        return;         
    }
}
document.onkeypress=update;

I want to disable/remove/replace this function with Greasemonkey.

I tried it with

unsafeWindow.update = function(){}

with no result! (got no errors in the console)

is there a way to kill this function?

解决方案

It's not clear that update is a global function. If it isn't then that approach won't work.

But you can override the keypress handler with:

unsafeWindow.document.onkeypress = function(){};

---

---

For a general, high-powered way to selectively block, or replace, any JS (on Firefox), use @run-at document-start and the checkForBadJavascripts function, like so:

// ==UserScript==
// @name        _Replace select javascript on a page
// @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,
        /document\.onkeypress\s*=\s*update/,
        function () {
            addJS_Node (myKeypressFunction.toString() );
            addJS_Node ('document.onkeypress = myKeypressFunction;');
        }
    ]
] );


function myKeypressFunction (evt) {
    /*  DO WHATEVER HERE BUT USE NO GREASEMONKEY FUNCTIONS INSIDE
        THIS FUNCTION.
    */
    console.log ("Keypress function fired.");
}

---

See this answer, for more information on checkForBadJavascripts.

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