在业力环境中使用Blob中的importsScripts

Question

我正在研究一个使用业力和茉莉花的小项目.我的目标浏览器是chrome 32.

我试图在我通过blob实例化的web worker中导入脚本,如下所示:

describeAsyncAppliPersephone("When the application project to DOM", function()
{
    it("it should call the function of DomProjection in the project associated with its event", function()
    {
        var eventSentBack = {
            eventType: 'testReceived',
            headers: { id: 14, version: 4 },
            payLoad: { textChanged: 'newText' }
        };
        var isRendered = false;
        var fnProjection = function(event, payload)
        {
            isRendered = true;
        }

        var bootstrap = [
            { eventType: 'testReceived', projection: fnProjection },
            { eventType: 'test2Received', projection: function() { } }
        ];

        runs(function()
        {
            var factory = new WorkerFactory();

        var worker = factory.CreateByScripts('importScripts("/base/SiteWeb/project/js/app/application.js"); var app = new application(self); app.projectOnDOM(' + JSON.stringify(eventSentBack) + '); ');

            console.log(worker.WorkerLocation);

            var applicationQueue = new queueAsync(worker);
            var projectQueue = new queueSync(worker);
            var p = new project(applicationQueue, persephoneQueue, bootstrap);

            applicationQueue.publish(eventSentBack);
        });

        waitsFor(function() { return isRendered }, "Projection called", 500);

        runs(function()
        {
            expect(isRendered).toBe(true);
        });


    });
});

workerFactory如下:

this.CreateByScripts = function(scripts, fDefListener, fOnError)
    {
        var arrayScripts = scripts;

        if (!arrayScripts)
            throw "unable to load worker for undefined scripts";

        if (Object.prototype.toString.call(arrayScripts) !== '[object Array]')
            arrayScripts = [arrayScripts];

        var blob = new Blob(arrayScripts, { type: "text/javascript" });

        var w = createWorker(window.URL.createObjectURL(blob));

        return new QueryableWorker(w, fDefListener, fOnError);
    }

其中createWorker是:

createWorker = function(sUrl)
        {
            return new Worker(sUrl);
        }

但是importScripts会抛出以下错误:

未捕获的SyntaxError:无法执行'importScripts':URL'/ base/SiteWeb/project/js/app/application.js'无效.

我试过浏览器中的路径:

http://mylocalhost:9876/base/SiteWeb/project/js/app/application.js

它确实运作良好.

我应该使用什么路径使importScripts成功运行？

谢谢,

Answer 1

您不能在使用Blob创建的worker中使用相对路径.

今天有这个问题.解决方案在"Web Worker的基础知识"中有解释,但文章的篇幅有点隐藏:

原因是:工作人员(现在从blob URL创建)将使用blob:前缀解析,而您的应用程序将从不同的(可能是http://)方案运行.因此,失败将归因于交叉来源限制.

如果您决定避免在您的工作人员中硬编码域名,那么该文章也提供了解决方案.在接收带有URL作为其参数之一的消息时导入脚本:

self.onmessage = function(e) {
    importScripts(e.data.url + 'yourscript.js');
};

并通过发送该网址启动您的工作人员

worker.postMessage({url: document.location.protocol + '//' + document.location.host});

为清楚起见,上面的代码被简化.