 const seqgen = function(data){
            // re-arrange the data sequentially; 
            let prestack = []; 
            dates.forEach(datum => {
                prestack.push({'日期': datum});
            });
            data.forEach(datum => {
                //sequential[alldates.indexOf(datum['日期'])].push(datum);
                prestack[dates.indexOf(datum['日期'])][datum[keyHint]] = yValue(datum);
            });
            return prestack
        }

        d3.csv(`./static/data/${data_