HTML5网络工作者在Firefox 4中工作，但不在Chrome 12.0.742.122中工作 [英] HTML5 Web Workers work in Firefox 4, but not in Chrome 12.0.742.122

问题描述

当我试图在HTML5中使用Web Workers功能时，我的firefox很开心，但是chrome抱怨：
$ b

When I tried to play around with Web Workers feature in HTML5, my firefox works happily but chrome complains that:

Uncaught TypeError：无法调用undefined
的方法'postMessage'xstartWorkerworker.html：7（匿名函数）worker.html：1
onclickworker.html：2

Uncaught TypeError: Cannot call method 'postMessage' of undefined xstartWorkerworker.html:7 (anonymous function)worker.html:1 onclickworker.html:2

worker.html

worker.html

<button onclick="xstartWorker()">Start worker</button>
<output id="result"></output>
<script>
function xstartWorker()
{
  worker.postMessage({'cmd': 'startWorker', 'msg': 'Start now!'});
}

var worker = new Worker('worker.js');

worker.addEventListener('message', function(e)
  {
      document.getElementById('result').textContent = e.data;
  }
  , false);
</script>

worker.js

worker.js

self.addEventListener('message', function(e)
{
  var data = e.data;
  switch (data.cmd)
  {
    case 'startWorker':
      self.postMessage('worker thread start now:' + data.msg);
      break;
    default:
      self.postMessage('default');
  }
}
, false);

我能做些什么使它在Chrome中工作？

What I can do to make it works in chrome?

顺便说一句，当我尝试在 http://playground.html5rocks.com/#inline_workers b $ b和这次chrome工作，但firefox抱怨说：

BTW, when I tried out the sample at http://playground.html5rocks.com/#inline_workers and this time chrome works, but firefox complains that

错误：worker未定义源文件：
http://playground.html5rocks.com/ 第39行

推荐答案

我猜你试图在你的本地机器上运行，而不是在网络服务器上运行。工作人员受到同源政策的限制，但作为链接的维基百科页面笔记，

I'm guessing you're trying to run this on your local machine, not on a webserver. Workers are restricted by the Same Origin Policy, but as the linked Wikipedia page notes,

相同来源检查和相关机制的行为不是
，在很多情况下都是定义良好的，例如
没有明确定义的与
URL（文件：，data：等）相关联的主机名或端口。

The behavior of same-origin checks and related mechanisms is not well-defined in a number of corner cases, such as for protocols that do not have a clearly defined host name or port associated with their URLs (file:, data:, etc.).

加载本地文件（即使是相对URL）与使用文件：协议加载文件相同。所以我的猜测是，问题是你试图加载 worker.js 作为本地文件 - Chrome不喜欢这个（出于一些安全的原因），尽管你可以通过像这样启动Chrome来强制这个问题： chrome.exe - 允许文件从文件访问

Loading a local file, even with a relative URL, is the same as loading a file with the file: protocol. So my guess is that the problem is that you're trying to load worker.js as a local file - Chrome doesn't like this (for some good security reasons), though you can force the issue by starting Chrome like this: chrome.exe --allow-file-access-from-files

或者，尝试在本地或远程网络服务器上处理脚本，看看是否解决了这个问题。 （如果你已经安装了Python，你可以进入相关目录并运行 python -m SimpleHTTPServer 8000 ，然后进入 http：// localhost：8000 / ）。

Alternatively, try serving your script on a local or remote webserver and see if that fixes the problem. (If you have Python installed, you can go to the directory in question and run python -m SimpleHTTPServer 8000, then go to http://localhost:8000/ in your browser).

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