Is there any maximum count of web worker that can be run at the same time? Thanks a lot.
Yes and no. With Web Workers, there's no hard limit but you are limited by the available CPU and memory.
There's a rather large amount of CPU and memory overhead that comes with each worker so you can bring the machine to a grind if you spin off a lot of workers.
I'd say Web Workers are best used for "long running" background tasks of 100 milliseconds or more.
The w3c doesn't mention any limitation (see http://www.w3.org/TR/workers/)
But it depends on what you are wanting to do, the limit will be the computer on which you will run the app (be kind with your users).
来源：https://stackoverflow.com/questions/11049797/maximum-running-web-worker-html5-at-the-same