What's the difference between window.location and document.location in JavaScript?
他们是否应该引用同一个对象？
According to the W3C, they are the same. In reality, for cross browser safety, you should use window.location rather than document.location .
See: http://www.w3.org/TR/html/browsers.html#dom-location
The canonical way to get the current location object is window.location (see this MSDN page from 1996 and the W3C draft from 2006).
Compare this to document.location , which originally only returned the current URL as a string (see this page on MSDN). Probably to avoid confusion, document.location was replaced with document.URL (see here on MSDN), which is also part of DOM Level 1.
As far as I know, all modern browsers map document.location to window.location , but I still prefer window.location as that's what I've used since I wrote my first DHTML.
window.location is read/write on all compliant browsers.
document.location is read-only in Internet Explorer (at least), but read/write in Gecko-based browsers (Firefox, SeaMonkey).
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