as well 可以直接用于just后，用作应答语（可视为It's just as well、的省略），作“幸亏，幸而；无妨；没关系”解。
例句：
We might as well finish up the cake.
我们倒不如把蛋糕吃完。
She doesn't play as well as her sister.
她演奏得不如她姐姐。
Anyway, you're here; you might as well stay.
无论如何你已在这里，你就留下来吧。
