git远程删除分支后，本地执行git branch -a依然能看到删除分支到底该咋整？

使用命令git branch -a可以查看所有本地分支和远程分支（git branch -r 可以只查看远程分支） 
如果发现很多在远程仓库已经删除的分支在本地依然可以看到到底该怎么办呢?(反正强迫症受不了一定要把本地的也同步删除了)

$ git branch -a

  movtop
  task_develop
* weibo
  remotes/origin/HEAD -> origin/task_develop
  remotes/origin/develop
  remotes/origin/fix_composer_repositories_type
  remotes/origin/join_weixin_module
  remotes/origin/master
  remotes/origin/mining-backup
  remotes/origin/movtop
  remotes/origin/right
  remotes/origin/schedule_dev
  remotes/origin/stuff_web_fix
  remotes/origin/task_develop
  remotes/origin/task_idea
  remotes/origin/task_temp
  remotes/origin/task_yqj
  remotes/origin/weibo
  remotes/origin/weixin_temp

使用命令 git remote show origin可以查看remote地址，远程分支，还有本地分支与之相对应关系等信息。

$ git remote show origin  

* remote origin
  Fetch URL: https://xxx@gitlab.com/xxx/xxx.git
  Push  URL: https://xxx@gitlab.com/xxx/xxx.git
  HEAD branch: task_develop
  Remote branches:
    master                                             tracked
    mining-backup                                      tracked
    refs/remotes/origin/develop                        stale (use 'git remote prune' to remove)
    refs/remotes/origin/fix_composer_repositories_type stale (use 'git remote prune' to remove)
    refs/remotes/origin/join_weixin_module             stale (use 'git remote prune' to remove)
    refs/remotes/origin/movtop                         stale (use 'git remote prune' to remove)
    refs/remotes/origin/right                          stale (use 'git remote prune' to remove)
    refs/remotes/origin/schedule_dev                   stale (use 'git remote prune' to remove)
    refs/remotes/origin/stuff_web_fix                  stale (use 'git remote prune' to remove)
    refs/remotes/origin/task_temp                      stale (use 'git remote prune' to remove)
    refs/remotes/origin/weibo                          stale (use 'git remote prune' to remove)
    task_develop                                       tracked
    task_idea                                          tracked
    task_yqj                                           tracked
    weixin_temp                                        tracked
  Local branches configured for 'git pull':
    movtop       merges with remote movtop
    task_develop merges with remote task_develop
    weibo        merges with remote weibo
  Local ref configured for 'git push':
    task_develop pushes to task_develop (up to date)

此时我们可以看到那些远程仓库已经不存在的分支，根据提示，使用 git remote prune origin 命令：

$ git remote prune origin

Pruning origin
URL: https://xxx@gitlab.com/xxx/xxx.git
 * [pruned] origin/develop
 * [pruned] origin/fix_composer_repositories_type
 * [pruned] origin/join_weixin_module
 * [pruned] origin/movtop
 * [pruned] origin/right
 * [pruned] origin/schedule_dev
 * [pruned] origin/stuff_web_fix
 * [pruned] origin/task_temp
 * [pruned] origin/weibo

这样就删除了那些远程仓库不存在的分支。