问题
As part of my application, I'm putting together a set of small Dom nodes that are not shown all at once. I'm storing them in an internal array. The user can invoke their display in which case I reparent them to the div that is used to display them. That's all well and good. But when it's time to replace all of them with new ones, I want to destroy the old ones (effectively deallocate them). Otherwise, over time, memory usage could grow exponentially. How do I force the browser js engine to do this? Is just setting each of the items in my array of Dom nodes to null enough? Is there something else I have to do? Or maybe I don't have to worry about this at all?
回答1:
If you set each item to null, they will be automatically garbage collected.
回答2:
Yes, setting the items to null should be ok… Except that some implementation details must be taken care of with Internet Explorer: its handling of circular references is dodgy. See http://msdn.microsoft.com/en-us/library/bb250448.aspx
Circular References—When mutual references are counted between Internet Explorer's COM infrastructure and any scripting engine, objects can leak memory
So you have to break circular references in some cases.
来源：https://stackoverflow.com/questions/526167/freeing-memory-used-by-unattached-dom-nodes-in-javascript