Git 中的tag指向一次commit的id，通常用来给开发分支做一个标记，如标记一个版本号。
git tag 查看所有的tag
git tag -a v1.01 -m "Relase version 1.01"
过滤查看
git tag -l
-l <pattern>, --list <pattern>
List tags with names that match the given pattern (or all if no pattern is given). Running
"git tag" without arguments also lists all tags. The pattern is a shell wildcard (i.e.,
matched using fnmatch(3)). Multiple patterns may be given; if any of them matches, the tag
is shown.
-a, --annotate
Make an unsigned, annotated tag object
-m <msg>, --message=<msg>
Use the given tag message (instead of prompting). If multiple -m options are given, their
values are concatenated as separate paragraphs. Implies -a if none of -a, -s, or -u <keyid>
is given.
-a 是添加标签，其后要跟新标签号，-m 及后面的字符串是对该标签的注释。
git tag -d v1.01
注解：-d 表示删除，后面跟要删除的tag名字
