問題描述：

提交代碼時，rebase了兩次，本地代碼丟失了，嚇得我差點跳起來。解決方法如下：
1、執行命令：

git reflog

d6ea731 (HEAD -> dev, origin/dev, master) HEAD@{0}: checkout: moving from master to dev
d6ea731 (HEAD -> dev, origin/dev, master) HEAD@{1}: merge dev: Fast-forward
37f7992 HEAD@{2}: checkout: moving from dev to master
d6ea731 (HEAD -> dev, origin/dev, master) HEAD@{3}: commit: branch test
37f7992 HEAD@{4}: checkout: moving from dev to dev
37f7992 HEAD@{5}: reset: moving to HEAD@{1}
66e655d HEAD@{6}: checkout: moving from master to dev
37f7992 HEAD@{7}: commit: commit
66e655d HEAD@{8}: checkout: moving from dev to master
66e655d HEAD@{9}: checkout: moving from master to dev
66e655d HEAD@{10}: checkout: moving from master to master
66e655d HEAD@{11}: checkout: moving from master to master
66e655d HEAD@{12}: checkout: moving from dev to master
66e655d HEAD@{13}: checkout: moving from dev to dev
66e655d HEAD@{14}: checkout: moving from master to dev
66e655d HEAD@{15}: commit: first commit
c9ae14a HEAD@{16}: commit (initial): first commit

2、用reset (Suppose the old commit was HEAD@{5} in the ref log)

git reset --hard HEAD@{7}
親測有效！解決了～解決了～

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以上。