类似 the way, 语法上和 when 一样。领导从句当状语。

下面是字典里面的解释：
If you say that something happens the moment something else happens, you are emphasizing that it happens immediately after the other thing. 一…就
强调
The moment I closed my eyes, I fell asleep.
我一闭上眼睛就睡着了。
所以the moment可以作连词，后面接句子 表示“一……就……”，相当于as soon as 。