从Greasemonkey访问变量到Page，反之亦然

• Greasemonkey脚本在单独的范围内运行，也可能在沙箱中运行，具体取决于

  @grant

  设置。

• 另外，问题代码隔离

  greasy

  在功能范围内（如gladoscc所说）。

• 最后，默认情况下， test.js 将在Greasemonkey脚本之前启动，因此无论如何它都不会看到任何设置变量。使用

  @run-at document-start

  来解决这个问题。

因此，鉴于此 test.js ，请在运行之前

</body>

window.targetPages_GlobalVar = 'stovetop';console.log ("On target page, local global: ", targetPages_GlobalVar);console.log ("On target page, script global: ", gmscripts_GlobalVar);

然后，以下将起作用：

没有沙箱：

// ==Userscript==// @name        _Greasemonkey and target page, variable interaction// @include     http://YOUR_SERVER.COM/YOUR_PATH/ @run-at      document-start// @grant       none// ==/Userscript==//--- For @grant none, could also use window. instead of unsafeWindow.unsafeWindow.gmscripts_GlobalVar = 'greasy';console.log ("In GM script, local global: ", unsafeWindow.targetPages_GlobalVar);console.log ("In GM script, script global: ", gmscripts_GlobalVar);window.addEventListener ("DOMContentLoaded", function() {    console.log ("In GM script, local global, after ready: ", unsafeWindow.targetPages_GlobalVar);}, false);

使用沙盒，没有函数作用域，

unsafeWindow

// ==Userscript==// @name        _Greasemonkey and target page, variable interaction// @include     http://YOUR_SERVER.COM/YOUR_PATH/ @run-at      document-start// @grant    GM_addStyle// ==/Userscript==unsafeWindow.gmscripts_GlobalVar = 'greasy';console.log ("In GM script, local global: ", unsafeWindow.targetPages_GlobalVar);console.log ("In GM script, script global: ", unsafeWindow.gmscripts_GlobalVar);window.addEventListener ("DOMContentLoaded", function() {    console.log ("In GM script, local global, after ready: ", unsafeWindow.targetPages_GlobalVar);}, false);

使用沙箱，没有函数作用域， 脚本注入 ：

// ==Userscript==// @name        _Greasemonkey and target page, variable interaction// @include     http://YOUR_SERVER.COM/YOUR_PATH/ @run-at      document-start// @grant       GM_addStyle// ==/Userscript==function GM_main () {    window.gmscripts_GlobalVar = 'greasy';    console.log ("In GM script, local global: ", window.targetPages_GlobalVar);    console.log ("In GM script, script global: ", window.gmscripts_GlobalVar);    window.addEventListener ("DOMContentLoaded", function() {        console.log ("In GM script, local global, after ready: ", window.targetPages_GlobalVar);    }, false);}addJS_Node (null, null, GM_main);function addJS_Node (text, s_URL, funcToRun, runOnLoad) {    var D  = document;    var scriptNode    = D.createElement ('script');    if (runOnLoad) {        scriptNode.addEventListener ("load", runOnLoad, false);    }    scriptNode.type   = "text/javascript";    if (text)       scriptNode.textContent  = text;    if (s_URL)      scriptNode.src          = s_URL;    if (funcToRun)  scriptNode.textContent  = '(' + funcToRun.toString() + ')()';    var targ = D.getElementsByTagName ('head')[0] || D.body || D.documentElement;    targ.appendChild (scriptNode);}

笔记：

1. 您可以在 此页面 （output.jsbin.com/esikut/1）上测试这些脚本。
2. 由于没有沙箱中，

   unsafeWindow

   并且

   window

   是相同的。

3. 所有这些脚本在控制台上产生相同的输出：

   In GM script, local global: undefined

   In GM script, script global: greasy
   On target page, local global: stovetop
   On target page, script global: greasy
   In GM script, local global, after ready: stovetop

4. 该 脚本注入 代码将在各种除了Firefox浏览器的工作。

   unsafeWindow

   目前仅适用于Firefox + Greasemonkey（或scriptish）或Chrome + Tampermonkey。