访问javascript对象中的值

Question

我在js中没有太多练习但是我需要在我的项目中使用它。我将不胜感激任何帮助。

我需要访问Chrome控制台中显示的对象中的值，如附图所示。我想读出值距离和持续时间。如果我尝试以简单的数组distanceDuration [index]来访问它，我会得到“未定义的”＃39;结果。我如何访问这些值？

obj.prop

Answer 1

我不完全理解你的问题。使用索引@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); DownloadTask task = new DownloadTask(); String result = null; try{ result = task.execute("thelinkIuse").get(); } catch (InterruptedException | ExecutionException e) { e.printStackTrace(); } } public class DownloadTask extends AsyncTask<String, Void, String>{ @Override protected String doInBackground(String... urls) { String result = ""; URL url; HttpURLConnection urlConnection = null; while (true) { try { url = new URL(urls[0]); urlConnection = (HttpURLConnection) url.openConnection(); InputStream in = urlConnection.getInputStream(); InputStreamReader reader = new InputStreamReader(in); int data = reader.read(); while (data != -1) { char current = (char) data; result += current; data = reader.read(); } return result; } catch (IOException e) { e.printStackTrace(); return "Failed"; } } } @Override protected void onPostExecute(String result) { super.onPostExecute(result); try { JSONArray arr = new JSONArray(result); for (int i = 0; i < arr.length(); i++) { JSONObject jsonPart = arr.getJSONObject(i); symbols.add(jsonPart.getString("symbol")); bids.add(jsonPart.getString("bid")); asks.add(jsonPart.getString("ask")); } Log.i("Symbols", String.valueOf(symbols)); Log.i("Bids", String.valueOf(bids)); Log.i("Asks", String.valueOf(asks)); } catch (JSONException e) { e.printStackTrace(); Log.i("failed", "failed"); } } } 访问数组中的第一个元素（距离），使用0访问第二个元素（持续时间）：

1

使用解构：

var distanceDuration = ['273 km', '2 hours 55 mins'];
var distance = distanceDuration[0];
var duration = distanceDuration[1];

但是，使用常规对象而不是数组似乎是更好的选择：

var distanceDuration = ['273 km', '2 hours 55 mins'];
var [distance, duration] = distanceDuration;