1.安装vundle插件；
2.安装vim-go；
3.安装最为头大的YouCompleteMe；
通过git clone 来离线安装YouCompleteMe。步骤如下：
cd ~/.vim/bundle
然后执行
git clone https://gitee.com/Random_Coder/YouCompleteMe.git把YouCompleteMe目录的所有者改为当前用户(bysu)
sudo chown -R bysu:bysu YouCompleteMe然后执行
git submodule update --init --recursive 
报上面的错一般是因为curl的postBuffer的默认值太小和git clone速度太慢，可能被限制了，现在贴出这两方面的解决方案。
postBuffer的默认值太小：
在这里，笔者把postBuffer的值配置成500M，对笔者来说已经够了。可以根据你需要下载的文件大小，将postBuffer值配置成合适的大小。
git config --global http.postBuffer 524288000这样已经配置好了，如果你不确定，可以根据以下命令查看postBuffer。
git clone速度太慢
1、查找域名对应的ip地址，并修改hosts文件
先执行 pacman -Sy dnsutils 安装dnsutils，要不会提示没有nslookup命令。 ifconfig,route在net-tools中，nslookup,dig在dnsutils中，ftp,telnet等在inetutils中,ip命令在iproute2中；netcfg
nslookup github.global.ssl.fastly.Net
Server: 127.0.0.53
Address: 127.0.0.53#53
Non-authoritative answer:
Name: github.global.ssl.fastly.Net
Address: 151.101.229.194
nslookup github.com
Server: 127.0.0.53
Address: 127.0.0.53#53
Non-authoritative answer:
Name: github.com
Address: 13.229.188.59
sudo vim /etc/hosts
在文末加上下面两行，下面分别对应上面查出来标了底色部分的内容。然后重启网络服务，archlinux上重启网络服务的命令找到了，但是提示不对，反正我是直接重启了的。
解决掉git clone慢的问题后，可以直接通过git clone把相关文件下到对应的目录
cd /home/bysu/.vim/bundle/YouCompleteMe/third_party
git clone https://github.com/Valloric/ycmd继续执行
git submodule update --init --recursive 不行就多试几次，搞完之后，要安装
编译之前先安装： cmake gcc
sudo pacman -Sy cmake gcc安装完后，开始执行下面进行编译
cd ~/.vim/bundle/YouCompleteMe
./install.py
##########如果需要支持golang########
./install.py --go-completer
##########如果需要同时支持多种语言如：golang，java，C########
./install.py --go-completer --java-completer --clangd-completer
##########如果需要插件当前支持的所有语言########
./install.py --all开始编译之后，我被卡在了45%那个地方，我以为是树莓派性能太差了的原因，第二天起来还是在45%，打算留个三天三夜，谁知道过一两个小时就报错了。这个时候连报错都觉得是好消息——报错没关系，就怕卡在那里又没错误。
[ 42%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/regex/src/regex_raw_buffer.cpp.o
[ 45%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/regex/src/regex_traits_defaults.cpp.o
c++: fatal error: Killed signal terminated program cc1plus
compilation terminated.
make[3]: *** [BoostParts/CMakeFiles/BoostParts.dir/build.make:232: BoostParts/CMakeFiles/BoostParts.dir/libs/regex/src/instances.cpp.o] Error 1
make[3]: *** Waiting for unfinished jobs....
make[3]: Leaving directory '/tmp/ycm_build_galdq8zl'
make[2]: *** [CMakeFiles/Makefile2:115: BoostParts/CMakeFiles/BoostParts.dir/all] Error 2
make[2]: Leaving directory '/tmp/ycm_build_galdq8zl'
make[1]: *** [CMakeFiles/Makefile2:149: ycm/CMakeFiles/ycm_core.dir/rule] Error 2
make[1]: Leaving directory '/tmp/ycm_build_galdq8zl'
make: *** [Makefile:131: ycm_core] Error 2
ERROR: the build failed.
NOTE: it is *highly* unlikely that this is a bug but rather
that this is a problem with the configuration of your system
or a missing dependency. Please carefully read CONTRIBUTING.md
and if you're sure that it is a bug, please raise an issue on the
issue tracker, including the entire output of this script
and the invocation line used to run it.搜索发现是因为树莓派内存不足引起报错。
解决方案： 通过增加swap交换分区来解决
再重新编译，这次100%了，总算成功了。
[ 88%] Building CXX object ycm/CMakeFiles/ycm_core.dir/Result.cpp.o
[ 90%] Building CXX object ycm/CMakeFiles/ycm_core.dir/Utils.cpp.o
[ 92%] Building CXX object ycm/CMakeFiles/ycm_core.dir/Word.cpp.o
[ 95%] Building CXX object ycm/CMakeFiles/ycm_core.dir/versioning.cpp.o
[ 97%] Building CXX object ycm/CMakeFiles/ycm_core.dir/ycm_core.cpp.o
[100%] Linking CXX shared library /home/bysu/.vim/bundle/YouCompleteMe/third_party/ycmd/ycm_core.so
make[3]: Leaving directory '/tmp/ycm_build_u4swi38l'
[100%] Built target ycm_core
make[2]: Leaving directory '/tmp/ycm_build_u4swi38l'
make[1]: Leaving directory '/tmp/ycm_build_u4swi38l'
CMake Error: The source directory "/home/bysu/.vim/bundle/YouCompleteMe/third_party/ycmd/third_party/cregex" does not appear to contain CMakeLists.txt.
Specify --help for usage, or press the help button on the CMake GUI.
ERROR: the build failed.
哈哈哈，功夫不负有心人啊！慢着“ERROR: the build failed.”是什么鬼？竟然构建失败了！！！！
通过搜索
CMake Error: The source directory "/home/bysu/.vim/bundle/YouCompleteMe/third_party/ycmd/third_party/cregex" does not appear to contain CMakeLists.txt.发现这是因为 ~/.vim/plugged/YouCompleteMe/third_party/ycmd/third_party/cregex/ 的内部文件没有clone下来
-- Generating done
-- Build files have been written to: /tmp/regex_build_znc86h74
make[1]: Entering directory '/tmp/regex_build_znc86h74'
make[2]: Entering directory '/tmp/regex_build_znc86h74'
make[3]: Entering directory '/tmp/regex_build_znc86h74'
Scanning dependencies of target _regex
make[3]: Leaving directory '/tmp/regex_build_znc86h74'
make[3]: Entering directory '/tmp/regex_build_znc86h74'
[ 66%] Building C object CMakeFiles/_regex.dir/regex_3/_regex.c.o
[ 66%] Building C object CMakeFiles/_regex.dir/regex_3/_regex_unicode.c.o
[100%] Linking C shared library /home/bysu/.vim/bundle/YouCompleteMe/third_party/ycmd/third_party/cregex/regex_3/_regex.so
make[3]: Leaving directory '/tmp/regex_build_znc86h74'
[100%] Built target _regex
make[2]: Leaving directory '/tmp/regex_build_znc86h74'
make[1]: Leaving directory '/tmp/regex_build_znc86h74'
go: downloading golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7