iFrame isolation
Just a thought, but would using an IFRAME
over a DIV
e开发者_运维知识库ssentially make that element isolated from the window in a way that slow scripts running in the IFRAME
wouldn't affect the other frames/window?
Yes for the first part, an iframe will "sort-of" isolate your window from the script in the iframe. However, the parent window can still be accessed via window.parent
.
For the second part: No, it will not make it so slow scripts in the iframe won't affect other frames/windows. Your main window object and its child nodes all run in the same thread. JavaScript is single threaded [Ignore webworkers in this case, you can't pass dom elements between them anyway], so the only reason you can access the parent-window/child-iframe's window object is because they're on the same thread.
To provide a quick example:
- Create a page called main.html
- In that page, have an iframe
src="iframe.html"
- Next to the iframe, have a button with whatever text you want, I don't care.
- In iframe.html,
window.onload = function(){ while(1){} };
- Access iframe.html. You'll notice that when you put your mouse cursor over the button, it doesn't respond/redraw. This is because the browser is frozen.
Source:
I tried getting multithreading like this too. Learned the hard way =)
In new browsers you can use the sandbox property to isolate the iframe from the rest of the page
http://www.w3schools.com/tags/att_iframe_sandbox.asp
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