8-2

http://caibaojian.com/js-splice-element.html

http://www.w3school.com.cn/jsref/jsref_indexOf.asp

http://www.365mini.com/page/javascript-array-sort.htm

http://bookshadow.com/weblog/2015/09/19/leetcode-move-zeroes/

http://blog.csdn.net/xudli/article/details/48574521