有條後路

You can visit Canada for a new H1 visa...

If you use a valid visa + passport to visit Canada, you can return to US within 90 days with the current visa. So you should have plenty of time to get a new H visa in Canada.

If you don't get one, don't go to China. However if you do get it, you won't use it on your way back, you can use it on your trip to China.

At least I was told so in 1997. I know another guy used the same approach in 1999.