在执行git push时，git会给一个warning，然后推送更新，内容如下。
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$ git push
warning: push.default is unset; its implicit value is changing in
Git 2.0 from 'matching' to 'simple'. To squelch this message
and maintain the current behavior after the default changes, use:
git config --global push.default matching
To squelch this message and adopt the new behavior now, use:
git config --global push.default simple
See 'git help config' and search for 'push.default' for further information.
(the 'simple' mode was introduced in Git 1.7.11. Use the similar mode
'current' instead of 'simple' if you sometimes use older versions of Git)
Counting objects: 10, done.
Delta compression using up to 12 threads.
Compressing objects: 100% (2/2), done.
Writing objects: 100% (6/6), 469 bytes | 0 bytes/s, done.
Total 6 (delta 0), reused 0 (delta 0)
To git@github0123:jeremy0123/fetch.git
c86dc9b..9d7c603 dev -> dev
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举个栗子直接解释这段英文，我们已经设置好master分支的upstream为origin/master，dev分支的upstream为origin/dev，并且我们在master分支上做了commit，同时，在dev分支上也做了commit。当push.default设置为matching时，执行git push，master分支和dev分支都会推送。
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$ git push
Counting objects: 10, done.
Delta compression using up to 12 threads.
Compressing objects: 100% (2/2), done.
Writing objects: 100% (6/6), 469 bytes | 0 bytes/s, done.
Total 6 (delta 0), reused 0 (delta 0)
To git@github0123:jeremy0123/fetch.git
c86dc9b..9d7c603 dev -> dev
8858616..91f9876 master -> master
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push.default设置为simple时，执行git push只会推送当前所在的分支，不会推送其他分支。
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$ git push
Counting objects: 10, done.
Delta compression using up to 12 threads.
Compressing objects: 100% (2/2), done.
Writing objects: 100% (6/6), 469 bytes | 0 bytes/s, done.
Total 6 (delta 0), reused 0 (delta 0)
To git@github0123:jeremy0123/fetch.git
c86dc9b..9d7c603 dev -> dev
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目前版本的Git默认使用matching模式，而推荐使用simple模式。
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