You can’t submit it like this! After executiongit commit -m '提交日志'，肯定要执行一下git push origin 分支才能更新到对应的远程分支。git commit -m '提交日志'It is useless to add modified files afterwards

That's right, git commit -m 'xxx' will only submit updates to files that have been added by git to the staging area, and in batches, that is, all files in the staging area will be submitted

git commit -m 'xxx' a.php, the specified file can be submitted without git add, but only one. If you want multiple files, you must append the complete file names one by one after the command

So if I want to commit all the modified files, but there is no git add to the staging area, I will use this command git commit -am 'x'

When files are given on the command line, the command commits the contents of the named files, without recording the changes already staged. The contents of these files are also staged for the next commit on top of what have been staged before.

Your understanding is correct. Finally, carrying the file parameters will directly commit the current contents of these files instead of the changes in the buffer.