Constructs a new up.Params instance from the given URL's
query string.
Constructs an empty up.Params instance if the given URL has no query string.
let params = up.Params.fromURL('http://foo.com?foo=fooValue&bar=barValue')
let foo = params.get('foo')
// foo is now: 'fooValue'
The URL from which to extract the query string.
The params from the given URL's query string.
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