git diff  工作区与暂存区的差别

git diff -cached / git diff -staged  暂存区与版本库的差别

git diff HEAD  工作区与版本库的差别

git diff branch1 branch2  两个分支的最新commit的差别

git diff branch1...branch2  自branch1与branch2分开以来，branch2上的变化

git diff --stat  查看简单的diff结果

git diff branch1  查看当前目录与另外一个分支的差别

git diff HEAD -- ./lib  显示当前目录的lib目录和上次提交之间的差别

git diff HEAD^ HEAD  查看上次提交与上上次提交的差别

git diff commit1 commit2  查看两次提交之间的差别

git diff