{
"Meta Data": {
"1. Information": "Daily Time Series with Splits and Dividend Events",
"2. Symbol": "IBM",
"3. Last Refreshed": "2020-04-17",
"4. Output Size": "Compact",
"5. Time Zone": "US/Eastern"
},
"Time Series (Daily)": {
"2020-04-17": {
"1. open": "119.3000",
"2. high": "120.3900",
"3. low": "117.9200",
"4. close": "120.1200",
"5. adjusted close": "120.1200",
"6. volume": "4944745",
"7. dividend amount": "0.0000",
"8. split coefficient": "1.0000"
},
"2020-04-16": {
"1. open": "119.0100",
"2. high": "119.7500",
"3. low": "114.4200",
"4. close": "115.7300",
"5. adjusted close": "115.7300",
"6. volume": "6438128",
"7. dividend amount": "0.0000",
"8. split coefficient": "1.0000"
},
这是我的代码
JSONObject json = await timeSeries.getDaily(stock);
var data = json.getJSONMap()["Time Series (Daily)"];
var data2 = Map<String, dynamic>.from(data);
data2.forEach((k, v) => open.add(double.parse(v["1. open"])));
data2.forEach((k, v) => close.add(double.parse(v["4. close"])));
我只想得到第一高点和第一低点。 119.300和120.390。
所示的代码有效,但我不想获得每个V,而只是获得第一个。
最佳答案
试试这个
JSONObject json = await timeSeries.getDaily(stock);
var data = json.getJSONMap()["Time Series (Daily)"];
var data2 = Map<String, dynamic>.from(data);
var firstKey = data2.keys.toList()[0];
open.add(data2[firstKey]["1. open"]);
close.add(data2[firstKey]["4. close"]);
关于json - 如何在flutter中获取JSON映射的第一个值?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/61304120/