项目应用到echarts图表组件、官网的demo中出现空数据会断开、经过跟踪调试、修改echarts.js以下代码即可实现断点连线功能(需要将空数据处理成'-'、这样才能均值)：

for (var k = 0; k < dimensions.length; k++) {                        var dim = dimensions[k];                        var dimStorage = storage[dim];                        if (dataItem == '-')//遇到空值处理、取前后两个数据的平均值                        {                            //debugger;                            var preItem = null, nextItem = null;                            for (var j = i - 1; j >= 0; j--) {
   //从当前数组索引往前找数据                                var myItem = parseFloat(data.getItem(j));                                if (myItem.toString() != 'NaN') {                                    preItem = myItem;                                    break;                                }                            }                            for (var j = i + 1; j < size; j++) {                                var myItem = parseFloat(data.getItem(j));                                if (myItem.toString() != 'NaN') {                                    nextItem = myItem;                                    break;                                }                            }                            if (preItem != null && nextItem!=null)                            {                                dataItem = ((preItem + nextItem) / 2).toFixed(2);                            }                            else if(preItem != null)                            {                                dataItem = preItem;                            }                            else if (nextItem != null) {                                dataItem = nextItem;                            }                        }                        // PENDING NULL is empty or zero                        dimStorage[i] = dimValueGetter(dataItem, dim, i, k);                    }