Revert "忽略所有.bak文件的配置，提交下，以后可以同步了，哈哈"

This reverts commit f8129d2e6cb2785d9ba679337223a5f71255933b.
Revert "Revert "忽略所有.bak文件的配置，提交下，以后可以同步了，哈哈""

This reverts commit ba68bfa4d760132d4396aa71a383e7917e2a1108.
Revert "第二个文件，想起怎么提交"

This reverts commit 05f06419c6836eb613a66d095835f756ef6dda4a.