问题
Will Cross Domain Tracking work between site-a.com and site-b.com, if for Example, site-a.com uses Asynchronous tracking code, but site-b.com uses the older "Traditional Syntax"?
回答1:
Yes, it doesn't matter how the data gets to GA's servers, as long as it gets there. If site-b.com and site-a.com are setup correctly, the fact that its a cross-domain configuration will not matter.
来源：https://stackoverflow.com/questions/9517284/google-analytics-cross-domain-tracking-asynchronous-on-one-site-traditional