Git的使用 checkout push merge

D:laragonwwwlaravel-qa>git branch
* master

D:laragonwwwlaravel-qa>git checkout -b lesson-2
Switched to a new branch 'lesson-2'

D:laragonwwwlaravel-qa>git status
On branch lesson-2
Changes not staged for commit:
  (use "git add <file>..." to update what will be committed)
  (use "git restore <file>..." to discard changes in working directory)
        modified:   app/User.php

Untracked files:
  (use "git add <file>..." to include in what will be committed)
        app/Http/Controllers/QuestionController.php
        app/Models/
        database/factories/QuestionFactory.php
        database/migrations/2020_05_09_192154_create_questions_table.php

no changes added to commit (use "git add" and/or "git commit -a")

D:laragonwwwlaravel-qa>git add -A
warning: LF will be replaced by CRLF in app/User.php.
The file will have its original line endings in your working directory
warning: LF will be replaced by CRLF in app/Http/Controllers/QuestionController.php.
The file will have its original line endings in your working directory
warning: LF will be replaced by CRLF in app/Models/Question.php.
The file will have its original line endings in your working directory
warning: LF will be replaced by CRLF in database/factories/QuestionFactory.php.
The file will have its original line endings in your working directory
warning: LF will be replaced by CRLF in database/migrations/2020_05_09_192154_create_questions_table.php.
The file will have its original line endings in your working directory

D:laragonwwwlaravel-qa>git commit -m "generate question model via artisan model generator"
[lesson-2 1851bad] generate question model via artisan model generator
 5 files changed, 174 insertions(+)
 create mode 100644 app/Http/Controllers/QuestionController.php
 create mode 100644 app/Models/Question.php
 create mode 100644 database/factories/QuestionFactory.php
 create mode 100644 database/migrations/2020_05_09_192154_create_questions_table.php

D:laragonwwwlaravel-qa>git push -u origin lesson-2
Enumerating objects: 22, done.
Counting objects: 100% (22/22), done.
Delta compression using up to 6 threads
Compressing objects: 100% (13/13), done.
Writing objects: 100% (14/14), 2.51 KiB | 367.00 KiB/s, done.
Total 14 (delta 4), reused 0 (delta 0), pack-reused 0
remote: Resolving deltas: 100% (4/4), completed with 4 local objects.
remote:
remote: Create a pull request for 'lesson-2' on GitHub by visiting:
remote:      https://github.com/dzkjz/laravel-qa/pull/new/lesson-2
remote:
To https://github.com/dzkjz/laravel-qa.git
 * [new branch]      lesson-2 -> lesson-2
Branch 'lesson-2' set up to track remote branch 'lesson-2' from 'origin'.

D:laragonwwwlaravel-qa>git checkout master
Switched to branch 'master'
Your branch is up to date with 'origin/master'.

D:laragonwwwlaravel-qa>git merge lesson-2
Updating ad06dbf..1851bad
Fast-forward
 app/Http/Controllers/QuestionController.php        | 85 ++++++++++++++++++++++
 app/Models/Question.php                            | 24 ++++++
 app/User.php                                       |  8 ++
 database/factories/QuestionFactory.php             | 12 +++
 .../2020_05_09_192154_create_questions_table.php   | 45 ++++++++++++
 5 files changed, 174 insertions(+)
 create mode 100644 app/Http/Controllers/QuestionController.php
 create mode 100644 app/Models/Question.php
 create mode 100644 database/factories/QuestionFactory.php
 create mode 100644 database/migrations/2020_05_09_192154_create_questions_table.php

D:laragonwwwlaravel-qa>git push -u origin master
Total 0 (delta 0), reused 0 (delta 0), pack-reused 0
To https://github.com/dzkjz/laravel-qa.git
   ad06dbf..1851bad  master -> master
Branch 'master' set up to track remote branch 'master' from 'origin'.

D:laragonwwwlaravel-qa>

git checkout –b lesson-2

执行后

之后的编辑结果都在该分支

当执行git checkout master切换到主节点后，会发现修改的代码或新增的文件都消失了，但是

执行 git merge lesson-2之后，就会将lesson-2的修改结果融合到主分支，lesson-2修改的代码或新增的文件就又都回来了。