var list = [{"dataTime":1480608000000,"values":[0,0,0,0],"orgid":157},{"dataTime":1480694400000,"values":[0,0,0,0],"orgid":157},{"dataTime":1480608000000,"values":[0,0,0,0],"orgid":158},{"dataTime":1480694400000,"values":[0,0,0,0],"orgid":158},{"dataTime":1480608000000,"values":[0,0,0,0],"orgid":159},{"dataTime":1480694400000,"values":[0,0,0,0],"orgid":159},{"dataTime":1480608000000,"values":[0,0,0,0],"orgid":160},{"dataTime":1480694400000,"values":[0,0,0,0],"orgid":160},{"dataTime":1480608000000,"values":[0,0,0,0],"orgid":161},{"dataTime":1480694400000,"values":[0,0,0,0],"orgid":161},{"dataTime":1480608000000,"values":[0,0,0,0],"orgid":162},{"dataTime":1480694400000,"values":[0,0,0,0],"orgid":162},{"dataTime":1480608000000,"values":[0,0,0,0],"orgid":168},{"dataTime":1480694400000,"values":[0,0,0,0],"orgid":168},{"dataTime":1480608000000,"values":[0,0,0,0],"orgid":169},{"dataTime":1480694400000,"values":[0,0,0,0],"orgid":169},{"dataTime":1480608000000,"values":[0,0,0,0],"orgid":170},{"dataTime":1480694400000,"values":[0,0,0,0],"orgid":170},{"dataTime":1480608000000,"values":[0,0,0,0],"orgid":238},{"dataTime":1480694400000,"values":[0,0,0,0],"orgid":238},{"dataTime":1480608000000,"values":[0,0,0,0],"orgid":273},{"dataTime":1480694400000,"values":[0,0,0,0],"orgid":273},{"dataTime":1480608000000,"values":[4,2,1,1],"orgid":38},{"dataTime":1480694400000,"values":[0,0,0,0],"orgid":38}]

var result = _.map(_.groupBy(list, 'dataTime'), function(list){ return list.reduce(function(obj, pre){ if(!pre)return obj; obj.values[0]+=pre.values[0];obj.values[1]+=pre.values[1];obj.values[2]+=pre.values[2];obj.values[3]+=pre.values[3]; return obj }) })

console.log(result)