Javascript 遍历Json并仅返回一些属性
是否可以搜索对象属性并在同一级别访问所有属性 我有步骤对象，它可以从1到n个属性（方向步骤）进行余弦。我只想选择具有相同级别值的属性：Javascript 遍历Json并仅返回一些属性,javascript,json,node.js,object,Javascript,Json,Node.js,Object,是否可以搜索对象属性并在同一级别访问所有属性 我有步骤对象，它可以从1到n个属性（方向步骤）进行余弦。我只想选择具有相同级别值的属性： "travel_mode" : "TRANSIT" 这意味着我可以访问例如name属性，该属性在travkl_模式行走的级别中不可用 "steps" : [ { "distance" : {
"travel_mode" : "TRANSIT"
"steps" : [
{
"distance" : {
"text" : "0,3 km",
"value" : 285
},
"travel_mode" : "WALKING"
},
{
"distance" : {
"text" : "13 m",
"value" : 13
},
"travel_mode" : "WALKING"
}
],
"travel_mode" : "WALKING"
},
{
"distance" : {
"text" : "2,5 km",
"value" : 2506
},
"departure_stop" : {
"location" : {
"lat" : 48.1157011,
"lng" : 11.6602402
},
"name" : "Mönchbergstraße"
},
"travel_mode" : "TRANSIT"
},
{
"distance" : {
"text" : "0,2 km",
"value" : 230
},
"travel_mode" : "WALKING"
},
{
"distance" : {
"text" : "15 m",
"value" : 15
},
"duration" : {
"text" : "1 Minute",
"value" : 16
},
"end_location" : {
"lat" : 48.1175728,
"lng" : 11.6371798
},
"html_instructions" : "\u003cb\u003eLinks\u003c/b\u003e Richtung \u003cb\u003eHeinrich-Wieland-Straße\u003c/b\u003e abbiegen",
"maneuver" : "turn-left",
"polyline" : {
"points" : "u~tdHu{_fAZH"
},
"start_location" : {
"lat" : 48.1177065,
"lng" : 11.6372328
},
"travel_mode" : "WALKING"
},
{
"distance" : {
"text" : "35 m",
"value" : 35
},
"duration" : {
"text" : "1 Minute",
"value" : 24
},
"end_location" : {
"lat" : 48.1176498,
"lng" : 11.6367222
},
"html_instructions" : "\u003cb\u003eRechts\u003c/b\u003e abbiegen auf \u003cb\u003eHeinrich-Wieland-Straße\u003c/b\u003e\u003cdiv style=\"font-size:0.9em\"\u003eDas Ziel befindet sich auf der linken Seite.\u003c/div\u003e",
"maneuver" : "turn-right",
"polyline" : {
"points" : "y}tdHk{_fAAHK|@AR"
},
"start_location" : {
"lat" : 48.1175728,
"lng" : 11.6371798
},
"travel_mode" : "WALKING"
}
],
"travel_mode" : "WALKING"
}
],
"traffic_speed_entry" : [],
"via_waypoint" : []
}
],
var answer = JSON.parse(body), busName;
for(key in answer){
if(key.indexOf("name") != -1){
busName = answer[key];
break;
}
}
但是我在busName中得到了未定义的值我将尝试帮助您使用经过验证的json
var answer = {
"steps": [
{
"distance": {
"text": "0,3 km",
"value": 285
},
"travel_mode": "WALKING"
},
{
"distance": {
"text": "13 m",
"value": 13
},
"travel_mode": "WALKING"
},
{
"distance": {
"text": "2,5 km",
"value": 2506
},
"departure_stop": {
"location": {
"lat": 48.1157011,
"lng": 11.6602402
},
"name": "Mönchbergstraße"
},
"travel_mode": "TRANSIT"
},
{
"distance": {
"text": "0,2 km",
"value": 230
},
"travel_mode": "WALKING"
},
{
"distance": {
"text": "15 m",
"value": 15
},
"duration": {
"text": "1 Minute",
"value": 16
},
"end_location": {
"lat": 48.1175728,
"lng": 11.6371798
},
"html_instructions": "<b>Links</b> Richtung <b>Heinrich-Wieland-Straße</b> abbiegen",
"maneuver": "turn-left",
"polyline": {
"points": "u~tdHu{_fAZH"
},
"start_location": {
"lat": 48.1177065,
"lng": 11.6372328
},
"travel_mode": "WALKING"
},
{
"distance": {
"text": "35 m",
"value": 35
},
"duration": {
"text": "1 Minute",
"value": 24
},
"end_location": {
"lat": 48.1176498,
"lng": 11.6367222
},
"html_instructions": "<b>Rechts</b> abbiegen auf <b>Heinrich-Wieland-Straße</b><div style=\"font-size:0.9em\">Das Ziel befindet sich auf der linken Seite.</div>",
"maneuver": "turn-right",
"polyline": {
"points": "y}tdHk{_fAAHK|@AR"
},
"start_location": {
"lat": 48.1175728,
"lng": 11.6371798
},
"travel_mode": "WALKING"
}
],
"traffic_speed_entry": [],
"via_waypoint": []
};
for (key in answer.steps) {
if (answer.steps[key].travel_mode && answer.steps[key].travel_mode === "TRANSIT") {
// do what you want with the answer.steps[key] object here
console.log(answer.steps[key].departure_stop.name); // Mönchbergstraße
}
}
我希望这会有所帮助，目前还不清楚您到底想实现什么。我认为您的json无效。我把它粘贴到了一个文件夹中，我不得不猜测你可能想让它验证什么。在你开始尝试访问密钥之前，你必须先弄清楚这一点。如果你只是控制台。日志（回答）你得到了什么？我不确定你想问什么。。。。你说的是每一个旅行模式为“运输”的物体，你想访问站点名称吗？或者对于任何对象中的任何移动模式，是否要访问任何其他对象的名称？
for (key in answer.steps) {
if (answer.steps[key].travel_mode && answer.steps[key].travel_mode === "TRANSIT") {
// do what you want with the answer.steps[key] object here
console.log(answer.steps[key].departure_stop.name); // Mönchbergstraße
}
}