问题
Was the event loop evaluation model used in web browsers to control interaction between DOM events (and later the network) concomitantly developed by Brendan Eich with JavaScript?
Or did it pre- or post-date JavaScript?
Edit: I am specifically asking about the placement of the event-loop inside browsers. I am aware the event loop is a long-standing invention.
回答1:
The event loop predates javascript.. but just by a tiny bit.
The event loop was introduced to support progressive download of pictures in Netscape. And almost immediately it was also used to support early rendering where DOM elements are displayed on screen before all images are downloaded.
At the time, other browsers displayed blank white screen while images are downloaded. The net effect is that Netscape appears to be faster even though it takes the same amount of time to download and render the complete page.
Once the event loop is there (initially to handle network code for downloading images) javascript processing was simply added into the loop.
来源：https://stackoverflow.com/questions/29799316/was-the-event-loop-model-used-in-web-browsers-to-control-interaction-between-dom