最佳路径分析结果里pathList的edgeFeatures属性即途径弧段信息,在调用edgeFeatures包含的弧段属性的时候，其他属性都显示正常，调用距离时无论是系统自带的SMLENGTH或者我自己定义的属性 显示都是NaN是为什么？？？
var edgefeatures = path.edgeFeatures;
for (var i = 0; i < edgefeatures.length; i++) {
var edgefeature = edgefeatures[i];
n = n + edgefeature.attributes["SMLENGTH"];
求指点
