交叉组装
var arrange = require ( './index' ) ;
var arr = [
[ 'A1' , 'A2' ] ,
[ 'B1' , 'B2' , 'B3' ] ,
[ 'C1' , 'C2' ]
] ;
/*
[
[ 'A1', 'B1', 'C1' ],
[ 'A1', 'B1', 'C2' ],
[ 'A1', 'B2', 'C1' ],
[ 'A1', 'B2', 'C2' ],
[ 'A1', 'B3', 'C1' ],
[ 'A1', 'B3', 'C2' ],
[ 'A2', 'B1', 'C1' ],
[ 'A2', 'B1', 'C2' ],
[ 'A2', 'B2', 'C1' ],
[ 'A2', 'B2', 'C2' ],
[ 'A2', 'B3', 'C1' ],
[ 'A
