就是剪切不存在buffer中，而是存在剪切板中；粘贴从剪切板粘贴。
#buffer 意思是缓冲器，指的应该是vim内寄存复制的东西的地方
#clipboard是剪切板，指的应该是系统中寄存复制的东西的地方
用vim这么久了，始终也不知道怎么在vim中使用系统粘贴板，通常要在网上复制一段代码都是先gedit打开文件，中键粘贴后关闭，然后再用vim打开编辑，真的不爽；上次论坛上有人问到了怎么在vim中使用系统粘贴板，印象里回复很多，有好几页的回复却没有解决问题，今天实在受不了了又在网上找办法，竟意外地找到了，贴出来分享一下。
如果只是想使用系统粘贴板的话直接在输入模式按Shift+Inset就可以了，下面讲一下vim的粘贴板的基础知识，有兴趣的可以看看，应该会有所收获的。
vim帮助文档里与粘贴板有关的内容如下：
1. vim有12个粘贴板，分别是0、1、2、...、9、a、“、＋；用:reg命令可以查看各个粘贴板里的内容。在vim中简单用y只是复制到“（双引号)粘贴板里，同样用p粘贴的也是这个粘贴板里的内容；
2. 要将vim的内容复制到某个粘贴板，需要退出编辑模式，进入正常模式后，选择要复制的内容，然后按"Ny完成复制，其中N为粘贴板号(注意是按一下双引号然后按粘贴板号最后按y)，例如要把内容复制到粘贴板a，选中内容后按"ay就可以了，有两点需要说明一下：
* “号粘贴板（临时粘贴板）比较特殊，直接按y就复制到这个粘贴板中了，直接按p就粘贴这个粘贴板中的内容；
* +号粘贴板是系统粘贴板，用"+y将内容复制到该粘贴板后可以使用Ctrl＋V将其粘贴到其他文档（如firefox、gedit）中，同理，要把在其他地方用Ctrl＋C或右键复制的内容复制到vim中，需要在正常模式下按"+p；
3. 要将vim某个粘贴板里的内容粘贴进来，需要退出编辑模式，在正常模式按"Np，其中N为粘贴板号，如上所述，可以按"5p将5号粘贴板里的内容粘贴进来，也可以按"+p将系统全局粘贴板里的内容粘贴进来。
摘自：http://www.cnblogs.com/softwaretesting/archive/2011/07/12/2104434.html
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源自：
http://www.zhihu.com/question/21203154
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这个问题我搞明白了