echarts 动态设置 数据

            myChart4.off('legendselectchanged');
            myChart4.on('legendselectchanged', (e) => {
                var selected = [];
                var keys = Object.keys(e.selected);
                for (var i = 0; i < keys.length; i++) {
                    if (e.selected[keys[i]]) {
                        selected.push(keys[i]);
                    }

                }

                var option = myChart4.getOption();
                var seriesList = option.series;
                var arr = []
                for (var i = 0; i < seriesList.length - 1; i++) {
                    if (selected.indexOf(seriesList[i].name) > -1) {
                        arr.push(seriesList[i].data);
                    }
                }

                var xAxisData = myChart4.getOption().xAxis[0].data;
                var TotalData = [];
                for (var i = 0; i < xAxisData.length; i++) {
                    var value = 0;
                    for (var j = 0; j < arr.length; j++) {
                        value += Number(arr[j][i]);
                    }
                    TotalData.push(Math.round(value, 2));
                }
                option.series[option.series.length - 1].data = TotalData;
                myChart4.setOption(option);
            });