从Firefox扩展中执行JS [英] Execute JS from Firefox extension

问题描述

 函数executeJS（document，script）{ 
 var script = document.createElement（'script'）; 
 script.setAttribute（'type'，'text / javascript'）; 
 script.appendChild（document.createTextNode（script））; 
 document.getElementsByTagName（'head'）[0] .appendChild（script）; 
 
 
 
 
 
 
方法调用如下所示： 
 
 
  executeJS（content.document，$（'＃+ this.id +'）.jixedbar（{showOnTop：true}）;）; 
  
这就是我得到的结果：
 
 
 < script type =text / javascript> 
 [object XPCNativeWrapper [object HTMLScriptElement]] 
< / script> 
  
我的代码有什么问题？ 
从Firefox扩展执行任意JS脚本的正确方法是什么？
解决方案
我不确定FF扩展，但是在普通的JS-land中，不需要 createTextNode 业务。在FF扩展之外，您可以使用  Node.textContent  —不过也许和 XPCNativeWrapper 类型不一样。 
 
 
  script.textContent = 'var foo = 1; alert（foo）;'
  
我认为 main 是你也有一个变量和一个名为 script 的参数。试试这个：
 
 pre code> function executeJS（document，scriptContent）{
 var script = document.createElement（'script'） ; 
 script.appendChild（document.createTextNode（scriptContent））; 
 document.head.appendChild（script）; 
 
  

类型属性真的没有必要，顺便说一句。

---

我刚刚遇到此页面，看起来可能是您要找的内容：

  const XUL = Namespace（xul，http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul）; 
 $ b函数injectScript（name）{
 //获取当前文件名
 let file = Components.stack.filename; 
 //删除由子脚本加载器
 //和尾部文件名
添加的任何前缀let directory = file.replace（/.*  - > | [^ \ / ] + $ / g，）; 
 
 //创建脚本节点
 let script = document.createElementNS（XUL，script）; 
 script.setAttribute（type，application / javascript; version = 1.8）; 
 script.setAttribute（src，directory + name）; 
 
 //将其注入文档的顶层元素
 document.documentElement.appendChild（script）; 
} 
 
 //注入脚本
 injectScript（script.js）; 
  

I'm trying to execute custom JS code from a Firefox extension using:

function executeJS(document, script) {
    var script = document.createElement('script');
    script.setAttribute('type', 'text/javascript');
    script.appendChild(document.createTextNode(script));
    document.getElementsByTagName('head')[0].appendChild(script);
}

The method call looks like:

executeJS(content.document, "$('#" + this.id + "').jixedbar({showOnTop:true});");

And this is the result that I get:

<script type="text/javascript">
    [object XPCNativeWrapper [object HTMLScriptElement]]
</script>

What's wrong with my code? What's the proper way of execution arbitrary JS script from Firefox extension?

解决方案

I'm not sure about FF extensions, but in "normal" JS-land, there's no need for the createTextNode business. Outside of FF extensions, you can use Node.textContent — though maybe it's different with the XPCNativeWrapper types.

script.textContent = 'var foo = 1; alert(foo);'

I think the main problem, however, is that you've also got a variable and a parameter both named script. Try this:

function executeJS(document, scriptContent) {
    var script = document.createElement('script');
    script.appendChild(document.createTextNode(scriptContent));
    document.head.appendChild(script);
}

The type attribute really is not necessary, BTW.

---

I just came across this page, which looks like it could be what you're looking for:

const XUL = Namespace("xul", "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul");

function injectScript(name) {
    // Get the current filename
    let file = Components.stack.filename;
    // Strip off any prefixes added by the sub-script loader
    // and the trailing filename
    let directory = file.replace(/.* -> |[^\/]+$/g, "");

    // Create the script node
    let script = document.createElementNS(XUL, "script");
    script.setAttribute("type", "application/javascript;version=1.8");
    script.setAttribute("src", directory + name);

    // Inject it into the top-level element of the document
    document.documentElement.appendChild(script);
}

// Inject the script
injectScript("script.js");

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