【发布时间】：2021-04-23 08:34:31
【问题描述】：
下面发布的geojson是调用后端的结果，我收到了数据对象中的数据并通过访问
data["geojson"][0]
我得到了下面发布的结果。 我的问题是如何在下面发布的 geojson 中获取以下键的值
type
features
我尝试了以下方法：
data["geojson"][0].type
data["geojson"][0]["type"]
data["geojson"][0].features
data["geojson"][0]["features"]
并且所有这些都返回未定义。
请让我知道如何获取 type 和 features 键中包含的值
geojson：
{
"type": "FeatureCollection",
"features": [
{
"type": "Feature",
"properties": {
"treeID": "35",
"XTOP": "289361.36",
"YTOP": "5627942.71",
"ZTOP": "8.96",
"Zmax": "8.96",
"Zmean": "3.88565217391304",
"Zmin": "-0.22",
"ID": "1"
},
"geometry": {
"type": "Polygon",
"coordinates": [ [ [6.01294596725522,50.7649619453627], [6.01294655084025,50.7649616904627], [6.01294480728641,50.7649601165684], [6.01290750549077,50.7649556522326], [6.01290401670994,50.7649636585763], [6.01290754960196,50.7649660879154], [6.01292208328504,50.7649672700401], [6.01292595809794,50.764966559787], [6.01294596725522,50.7649619453627] ] ]
}
},
{
"type": "Feature",
"properties": {
"treeID": "36",
"XTOP": "289364.9",
"YTOP": "5627941.39",
"ZTOP": "8.61",
"Zmax": "8.61",
"Zmean": "1.70708487084871",
"Zmin": "-0.23",
"ID": "2"
},
"geometry": {
"type": "Polygon",
"coordinates": [ [ [6.01303976949995,50.7649411418857], [6.01305108930002,50.7649371142921], [6.01305889189702,50.764932636732], [6.01301768721015,50.7649026156833], [6.01295732492073,50.7649261653276], [6.01294076115474,50.7649457103209], [6.01294266753767,50.7649580827532], [6.01295011530617,50.764959173193], [6.01295547908076,50.764959580542], [6.01298047870417,50.7649545543143], [6.01303976949995,50.7649411418857] ] ]
}
},
{
"type": "Feature",
"properties": {
"treeID": "44",
"XTOP": "289371.82",
"YTOP": "5627938.69",
"ZTOP": "6.68",
"Zmax": "6.68",
"Zmean": "0.923793103448276",
"Zmin": "-0.2",
"ID": "3"
},
"geometry": {
"type": "Polygon",
"coordinates": [ [ [6.01309078592578,50.7649173526471], [6.01307507511104,50.7649146111696], [6.01306638577937,50.7649151980216], [6.01305830553487,50.7649284838627], [6.01307735761254,50.7649322105161], [6.01309522551646,50.7649278110408], [6.01309078592578,50.7649173526471] ] ]
}
},
{
"type": "Feature",
"properties": {
"treeID": "24",
"XTOP": "289387.04",
"YTOP": "5627931.21",
"ZTOP": "11.13",
"Zmax": "11.13",
"Zmean": "2.8069921875",
"Zmin": "-0.4",
"ID": "4"
},
"geometry": {
"type": "Polygon",
"coordinates": [ [ [6.01328734454998,50.7648331572413], [6.01328584413784,50.7648322192551], [6.01328139148204,50.7648330946158], [6.01321534224203,50.7648657637964], [6.01320827030382,50.7648877109824], [6.01321376130126,50.764892799138], [6.0132465933806,50.7648895028071], [6.01332086831076,50.7648724264007], [6.01332608767231,50.764868422333], [6.01332753378007,50.7648657608056], [6.01328734454998,50.7648331572413] ] ]
}
},
{
"type": "Feature",
"properties": {
"treeID": "26",
"XTOP": "289385.57",
"YTOP": "5627933.28",
"ZTOP": "9.45",
"Zmax": "9.45",
"Zmean": "2.38978260869565",
"Zmin": "-0.17",
"ID": "5"
},
"geometry": {
"type": "Polygon",
"coordinates": [ [ [6.01327356674159,50.7648891147094], [6.01328421708838,50.7648866890897], [6.01330010250613,50.7648822387717], [6.01327865741243,50.7648826786135], [6.01325645133365,50.7648861573501], [6.01323567273339,50.7648894927636], [6.01321953843652,50.7648933969757], [6.01321456939895,50.7648956983472], [6.01322071837631,50.7648993641185], [6.01323256304289,50.7648982284572], [6.01327356674159,50.7648891147094] ] ]
}
},
{
"type": "Feature",
"properties": {
"treeID": "27",
"XTOP": "289385.38",
"YTOP": "5627929.41",
"ZTOP": "8.65",
"Zmax": "8.65",
"Zmean": "1.83042253521127",
"Zmin": "-0.16",
"ID": "6"
},
"geometry": {
"type": "Polygon",
"coordinates": [ [ [6.01328506051132,50.7648178066857], [6.01328365738379,50.7648153419914], [6.0132786226098,50.7648142234655], [6.01327293558325,50.7648144375174], [6.01326339665165,50.7648150026084], [6.01325726764683,50.7648154751905], [6.01324869545512,50.7648275790463], [6.01325507746368,50.7648387168901], [6.01327269485743,50.7648449254249], [6.01328770190544,50.7648498077109], [6.01328895916927,50.7648501097939], [6.01329324733273,50.7648495900291], [6.01329357632041,50.7648488788368], [6.01329338905776,50.7648406883115], [6.01328506051132,50.7648178066857] ] ]
}
},
{
"type": "Feature",
"properties": {
"treeID": "22",
"XTOP": "289387.77",
"YTOP": "5627931.51",
"ZTOP": "11.13",
"Zmax": "11.13",
"Zmean": "5.20431818181818",
"Zmin": "-0.19",
"ID": "7"
},
"geometry": {
"type": "Polygon",
"coordinates": [ [ [6.01333437641733,50.7648741219068], [6.01333561090581,5
【问题讨论】：
-
您尝试的是正确的方法，因此对象的实际结构不是您发布的那个。这也很可能是一个异步类型的问题，您正在尝试访问尚不存在的数据。请发布更多相关代码。
标签： javascript json angular geojson