问题
What are the differences between chrome.runtime.getURL and chrome.extension.getURL?
The documentation implies that chrome.runtime.getURL works in both apps and extensions, and this 2012 announcement indicates that some APIs (though not getURL) have moved from chrome.extension to chrome.runtime.
What's the point of chrome.extension.getURL then, and why isn't it deprecated in favor of chrome.runtime.getURL?
回答1:
The chrome.extension.getURL is now deprecated, you should use chrome.runtime.getURL.
From the chrome.extension.getURL's docs:
Deprecated since Chrome 58. Please use runtime.getURL.
回答2:
There isn't any, really.
There are some similar functions there with differences, like .getBackgroundPage, but in this case there's no effective difference.
And as you said yourself, it's not deprecated either. Why? Maybe just overlooked. extension API is older than runtime.
来源：https://stackoverflow.com/questions/32344868/chrome-runtime-geturl-vs-chrome-extension-geturl