拖拽

http://www.jb51.net/article/29890.htm

http://blog.csdn.net/wlchn/article/details/50318653

http://blog.csdn.net/u013066244/article/details/51954198

http://www.jb51.net/article/96446.htm

http://haoningabc.iteye.com/blog/1593640

http://blog.csdn.net/u013066244/article/details/51954198

http://www.oschina.net/code/snippet_203508_7090

http://rubaxa.github.io/Sortable/

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原文地址：https://www.cnblogs.com/zwei1121/p/7445289.html