修改代码：
给前台的json数据：
{ hostId: 2616, hostNo: 闽C0C133, list: [{ pathDate: 2017-02-22, startTime: 2017-02-2209: 21: 19, endTime: 2017-02-2217: 56: 21, startAddress: 泉州市惠安县西苑路85号, startLon: 118.791344, startLat: 25.034976, endAddress: 泉州市晋江市德泰路4-2号, endLon: 118.556072, endLat: 24.877144, trackKm: 47.573, stopTimeLen: null, runTimeLen: 1小时18分2秒, partList: [{ pathDate: null, startTime: 2017-02-2209: 21: 19, endTime: 2017-02-2209: 22: 43, startAddress: 泉州市惠安县西苑路85号, startLon: 118.791344, startLat: 25.034976, endAddress: 泉州市惠安县西苑路75号, endLon: 118.7924, endLat: 25.033736, trackKm: 0.184, stopTimeLen: 2小时59分27秒, runTimeLen: 1分24秒, partList: null, startTrackKm: null, endTrackKm: null, extraMap: null }, { pathDate: null, startTime: 2017-02-2212: 22: 10, endTime: 2017-02-2212: 23: 17, startAddress: 泉州市惠安县科山路22号, startLon: 118.792088, startLat: 25.034026, endAddress: 泉州市惠安县西苑路85号, endLon: 118.791304, endLat: 25.035106, trackKm: 0.221, stopTimeLen: 2小时26分28秒, runTimeLen: 1分7秒, partList: null, startTrackKm: null, endTrackKm: null, extraMap: null }, { pathDate: null, startTime: 2017-02-2214: 49: 45, endTime: 2017-02-2214: 51: 10, startAddress: 泉州市惠安县西苑路85号, startLon: 118.791256, startLat: 25.035078, endAddress: 泉州市惠安县西苑路75号, endLon: 118.792408, endLat: 25.033748, trackKm: 0.205, stopTimeLen: 33分17秒, runTimeLen: 1分25秒, partList: null, startTrackKm: null, endTrackKm: null, extraMap: null }, { pathDate: null, startTime: 2017-02-2215: 24: 27, endTime: 2017-02-2215: 29: 15, startAddress: 泉州市惠安县科山路20号, startLon: 118.79168, startLat: 25.033708, endAddress: 泉州市惠安县科山路18号, endLon: 118.79208, endLat: 25.033472, trackKm: 0.326, stopTimeLen: 22分2秒, runTimeLen: 4分48秒, partList: null, startTrackKm: null, endTrackKm: null, extraMap: null }, { pathDate: null, startTime: 2017-02-2215: 51: 17, endTime: 2017-02-2215: 54: 43, startAddress: 泉州市惠安县科山路20号, startLon: 118.792192, startLat: 25.033548, endAddress: 泉州市惠安县科山路36号, endLon: 118.793112, endLat: 25.036988, trackKm: 0.59, stopTimeLen: 48分41秒, runTimeLen: 3分26秒, partList: null, startTrackKm: null, endTrackKm: null, extraMap: null }, { pathDate: null, startTime: 2017-02-2216: 43: 24, endTime: 2017-02-2217: 22: 51, startAddress: 泉州市惠安县科山路36号, startLon: 118.793184, startLat: 25.036998, endAddress: 泉州市丰泽区段湖路134号, endLon: 118.58272, endLat: 24.926766, trackKm: 37.128, stopTimeLen: 7分5秒, runTimeLen: 39分27秒, partList: null, startTrackKm: null, endTrackKm: null, extraMap: null }, { pathDate: null, startTime: 2017-02-2217: 29: 56, endTime: 2017-02-2217: 56: 21, startAddress: 泉州市丰泽区段湖路134号, startLon: 118.582736, startLat: 24.926868, endAddress: 泉州市晋江市德泰路4-2号, endLon: 118.556072, endLat: 24.877144, trackKm: 8.919, stopTimeLen: , runTimeLen: 26分25秒, partList: null, startTrackKm: null, endTrackKm: null, extraMap: null }], startTrackKm: 1728.565, endTrackKm: 1776.138, extraMap: null }], retCode: 0, retMsg: , pkId: null, extraMap: null }可以看出有startTrackKm: 1728.565,endTrackKm: 1776.138都在list里面，OK
