Why are web workers not allowed to modify the dom

问题

I know web workers work as a separate thread than the UI thread but i dont understand why they are not allowed to modify the DOM. I mean that you can allow inter thread communication and keep the DOM data in a shared space and have the web workers thread modify the DOM. Why is this not allowed in browsers?

回答1:

Because the DOM is not threadsafe, and JavaScript does not expose a thread API.

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See also:

• Is JavaScript multithreaded?
• Thread Safety in Javascript?
• Using web workers - About thread safety

来源：https://stackoverflow.com/questions/7082190/why-are-web-workers-not-allowed-to-modify-the-dom