echarts3.0版本斷點連線的處理

項目應用到echarts圖表組件、官網的demo中出現空數據會斷開、經過跟蹤調試、修改echarts.js以下代碼即可實現斷點連線功能(需要將空數據處理成'-'、這樣才能均值)：

for (var k = 0; k < dimensions.length; k++) {
                        var dim = dimensions[k];
                        var dimStorage = storage[dim];
                        if (dataItem == '-')//遇到空值處理、取前后兩個數據的平均值
                        {
                            //debugger;
                            var preItem = null, nextItem = null;
                            for (var j = i - 1; j >= 0; j--) {//從當前數組索引往前找數據
                                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);
                    }