Mozilla Addon Development - 在具有不同域的窗口之间进行通信(Mozilla Addon Development - Communicating between windows with different domains)

 我正在尝试创建一个插件，允许用户随意查询字典网站并查看所选单词的定义。 我一直在努力寻找一种方法来在页面工作者之间进行通信，我必须访问字典站点条目的DOM和用户正在查看的主页面。 我知道页面工作者能够从DOM中删除定义，因为我能够看到定义记录到控制台。 我遇到了让postMessage和onMessage合作的问题。 我目前正在尝试使用iframe弥补差距，但欢迎采用其他方法。 
 
 以下是我的代码中的一些内容...... 
 
 index.js： 
 
var getDefinition = "var def = document.getElementsByClassName('def-content');" +
                    "definition = def[0].textContent;" +
                    "word = document.getElementsByClassName('js-headword');" +
                    "word = word.textContent;" +
                    "self.port.emit('dialog', definition);" +
                    "var thiswin = document.getElementById('example').contentWindow;" +
                    "thiswin.postMessage(definition, '*');"

currPage = require("sdk/page-mod").PageMod({
    include: "*",
    contentScriptWhen: "ready",
    contentScriptFile: [
        data.url("jquery.js"),
        data.url("jquery-ui.min.js"),
        data.url("define.js"),
    ],
    onMessage: function(message){
        console.log("received message");
    },
    onAttach: function(worker){
        workers.push(worker);

        worker.on("message", function(definition){
            console.log("received message");
        });

        worker.port.on("dblclick", function(selected, thispage){
            newPage = require("sdk/page-worker").Page({
                contentURL: "http://dictionary.reference.com/browse/" + selected,
                contentScriptWhen: "ready",
                contentScriptFile: [
                    data.url("jquery.js"),
                    data.url("jquery-ui.min.js"),
                    data.url("iframe.js")
                ],
                contentScript: getDefinition,
                onMessage: function(message){
                    console.log("received message");
                }
            });
        });
    }
});
 
 define.js： 
 
function calldictionary(definition){
    console.log("here comes calldictionary");
    console.log(definition);
    $('div#definition').text(definition);
    $('#define').dialog("open");
}

function send(){
    var selected = getSelected();
    if (selected != ""){
        var mainwin = document.getElementById('example').contentWindow;
        $('iframe#example').attr('src', 'http://dictionary.reference.com/browse/' + selected);
        self.port.emit("dblclick", selected);
    }
}

function getSelected() {
    if (window.getSelection) {
        return window.getSelection().toString();
    } else if (document.selection) {
        return document.selection.createRange().text;
    }
    return '';
}

$(window).dblclick(function() {
    send();
});

window.addEventListener("message", function(event){
    if (event.origin == "dictionary.reference.com"){
    console.log("received message");}
    }, false);

I am trying to create an addon that will allow the user to query a dictionary site at will and view the definition of a chosen word. I have been struggling to find a way to communicate between the page-worker that I have to access the DOM of the dictionary site entry and the main page that the user is viewing. I know that the page-worker is able to scrape the definition from the DOM, as I am able to see the definition logged to the console. I am having issues getting postMessage and onMessage to cooperate. I am currently attempting to bridge the gap using iframes, though other approaches are welcome.
 
Here are some bits of my code...
 
index.js:
 
var getDefinition = "var def = document.getElementsByClassName('def-content');" +
                    "definition = def[0].textContent;" +
                    "word = document.getElementsByClassName('js-headword');" +
                    "word = word.textContent;" +
                    "self.port.emit('dialog', definition);" +
                    "var thiswin = document.getElementById('example').contentWindow;" +
                    "thiswin.postMessage(definition, '*');"

currPage = require("sdk/page-mod").PageMod({
    include: "*",
    contentScriptWhen: "ready",
    contentScriptFile: [
        data.url("jquery.js"),
        data.url("jquery-ui.min.js"),
        data.url("define.js"),
    ],
    onMessage: function(message){
        console.log("received message");
    },
    onAttach: function(worker){
        workers.push(worker);

        worker.on("message", function(definition){
            console.log("received message");
        });

        worker.port.on("dblclick", function(selected, thispage){
            newPage = require("sdk/page-worker").Page({
                contentURL: "http://dictionary.reference.com/browse/" + selected,
                contentScriptWhen: "ready",
                contentScriptFile: [
                    data.url("jquery.js"),
                    data.url("jquery-ui.min.js"),
                    data.url("iframe.js")
                ],
                contentScript: getDefinition,
                onMessage: function(message){
                    console.log("received message");
                }
            });
        });
    }
});
 
define.js:
 
function calldictionary(definition){
    console.log("here comes calldictionary");
    console.log(definition);
    $('div#definition').text(definition);
    $('#define').dialog("open");
}

function send(){
    var selected = getSelected();
    if (selected != ""){
        var mainwin = document.getElementById('example').contentWindow;
        $('iframe#example').attr('src', 'http://dictionary.reference.com/browse/' + selected);
        self.port.emit("dblclick", selected);
    }
}

function getSelected() {
    if (window.getSelection) {
        return window.getSelection().toString();
    } else if (document.selection) {
        return document.selection.createRange().text;
    }
    return '';
}

$(window).dblclick(function() {
    send();
});

window.addEventListener("message", function(event){
    if (event.origin == "dictionary.reference.com"){
    console.log("received message");}
    }, false);

原文：