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比如arr1 = [1,2,3,4,5,6,7,8,9,10];按每三个一组拆分想得到arr2 = [[1,2,3],[4,5,6],[7,8,9],[10]];
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var arr =[1,2,3,4,5,6,7,8,9,10]; var result = _.toArray(_.groupBy(arr, function(num, index){ return Math.floor(index/3);}));
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