Command Reference
git diff 教程
讲清 git diff 如何比较工作区、暂存区和提交之间的差异，以及最常见的几种比较方式。
一句话理解
git diff 用来比较两个状态之间的差异，它既可以看工作区，也可以看暂存区和历史提交。
最常见三种比较
git diff
git diff --staged
git diff HEAD
git diff：工作区 vs 暂存区git diff --staged：暂存区 vs HEADgit diff HEAD：工作区 + 暂存区 vs HEAD
比较分支
git diff main...feature/login
适合在 review 前快速确认分支差异。
一个常见误区
git diff 没输出不一定表示“没改动”，有可能是因为改动已经进了暂存区，所以这时要看 git diff --staged。