有没有办法从React Native中的JSON文件中获取所需信息
我正在使用一个新冠病毒-19 API（），它记录了美国每个县的病例数和死亡人数等各种信息。在我的React Native应用程序中，我检索到了用户的位置，更具体地说，检索到了用户的县、州和国家。在本例中，我将用户的县名称存储在有没有办法从React Native中的JSON文件中获取所需信息,json,typescript,react-native,api,fetch,Json,Typescript,React Native,Api,Fetch,我正在使用一个新冠病毒-19 API（），它记录了美国每个县的病例数和死亡人数等各种信息。在我的React Native应用程序中，我检索到了用户的位置，更具体地说，检索到了用户的县、州和国家。在本例中，我将用户的县名称存储在countyName中。我想根据什么是countyName从JSON文件中获取具体的病例和死亡。下面的JSON文件中有一个县的片段。我想我可以进入数组的索引和实际值，然后获取病例和死亡 [ { "fips": "02013"
countyNamecountyName[
{
"fips": "02013",
"country": "US",
"state": "AK",
"county": "Aleutians East Borough",
"level": "county",
"lat": null,
"locationId": "iso1:us#iso2:us-ak#fips:02013",
"long": null,
"population": 3337,
"metrics": {
"testPositivityRatio": null,
"testPositivityRatioDetails": {
"source": "other"
},
"caseDensity": 0,
"contactTracerCapacityRatio": null,
"infectionRate": 4.71887277063,
"infectionRateCI90": 1.1615979428900003,
"icuHeadroomRatio": null,
"icuHeadroomDetails": null,
"icuCapacityRatio": null,
"vaccinationsInitiatedRatio": null,
"vaccinationsCompletedRatio": 0.27509739286784535
},
"riskLevels": {
"overall": 0,
"testPositivityRatio": 4,
"caseDensity": 0,
"contactTracerCapacityRatio": 4,
"infectionRate": 3,
"icuHeadroomRatio": 4,
"icuCapacityRatio": 4
},
"actuals": {
"cases": 363,
"deaths": 2,
"positiveTests": null,
"negativeTests": null,
"contactTracers": null,
"hospitalBeds": {
"capacity": null,
"currentUsageTotal": null,
"currentUsageCovid": null,
"typicalUsageRate": null
},
"icuBeds": {
"capacity": null,
"currentUsageTotal": null,
"currentUsageCovid": null,
"typicalUsageRate": null
},
"newCases": 0,
"newDeaths": 0,
"vaccinesDistributed": null,
"vaccinationsInitiated": null,
"vaccinationsCompleted": 918,
"vaccinesAdministered": null,
"vaccinesAdministeredDemographics": null,
"vaccinationsInitiatedDemographics": null
},
"annotations": {
"cases": {
"sources": [
{
"type": "NYTimes",
"url": "https://github.com/nytimes/covid-19-data",
"name": "The New York Times"
}
],
"anomalies": []
},
"deaths": {
"sources": [
{
"type": "NYTimes",
"url": "https://github.com/nytimes/covid-19-data",
"name": "The New York Times"
}
],
"anomalies": []
},
"positiveTests": null,
"negativeTests": null,
"contactTracers": null,
"hospitalBeds": null,
"icuBeds": null,
"newCases": null,
"newDeaths": null,
"vaccinesDistributed": null,
"vaccinationsInitiated": null,
"vaccinationsCompleted": {
"sources": [
{
"type": "other",
"url": "https://covid.cdc.gov/covid-data-tracker/#county-view",
"name": "Centers for Disease Control and Prevention"
}
],
"anomalies": []
},
"vaccinesAdministered": null,
"testPositivityRatio": null,
"caseDensity": {
"sources": [
{
"type": "NYTimes",
"url": "https://github.com/nytimes/covid-19-data",
"name": "The New York Times"
}
],
"anomalies": []
},
"contactTracerCapacityRatio": null,
"infectionRate": {
"sources": [
{
"type": "NYTimes",
"url": "https://github.com/nytimes/covid-19-data",
"name": "The New York Times"
}
],
"anomalies": []
},
"infectionRateCI90": {
"sources": [
{
"type": "NYTimes",
"url": "https://github.com/nytimes/covid-19-data",
"name": "The New York Times"
}
],
"anomalies": []
},
"icuHeadroomRatio": null,
"icuCapacityRatio": null,
"vaccinationsInitiatedRatio": null,
"vaccinationsCompletedRatio": null
},
"lastUpdatedDate": "2021-04-26",
"url": "https://covidactnow.org/us/alaska-ak/county/aleutians_east_borough"
},
从JSON格式的API得到的响应是一个对象数组。 要从对象数组中获取死亡人数和病例数，需要执行以下操作：
const响应=[
{
“fips”：“02013”，
“国家”：“美国”，
“国家”：“AK”，
“县”：“阿留申东区”，
“级别”：“县”，
“lat”：空，
“locationId:“iso1:us#iso2:us ak#fips:02013”，
“long”：空，
“人口”：3337，
“指标”：{
“testPositivityRatio”：空，
“testPositivityRatioDetails”：{
“来源”：“其他”
},
“案例密度”：0，
“contactTracerCapacityRatio”：空，
“感染率”：4.71887277063，
“感染率90”：1.1615979428900003，
“icuHeadroomRatio”：空，
“icuHeadroomDetails”：空，
“icuCapacityRatio”：空，
“疫苗接种启动比率”：空，
“疫苗接种完成率”：0.27509739286784535
},
“风险水平”：{
“总体”：0，
“测试阳性率”：4，
“案例密度”：0，
“contactTracerCapacityRatio”：4，
“感染率”：3，
“icuHeadroomRatio”：4，
“icuCapacityRatio”：4
},
“实际值”：{
“案例”：363，
“死亡”：2，
“实证主义者”：空，
“否定测试”：空，
“contactTracers”：空，
“病床”：{
“容量”：空，
“currentUsageTotal”：空，
“currentUsageCovid”：空，
“typicalUsageRate”：空
},
“icuBeds”：{
“容量”：空，
“currentUsageTotal”：空，
“currentUsageCovid”：空，
“typicalUsageRate”：空
},
“新案例”：0，
“新死亡”：0，
“已分配疫苗”：无效，
“疫苗接种启动”：空，
“疫苗接种完成”：918，
“接种者”：无效，
“疫苗接种给药记录”：空，
“疫苗接种启动的内存”：null
},
“注释”：{
“案例”：{
“资料来源”：[
{
“类型”：“纽约时报”，
“url”：”https://github.com/nytimes/covid-19-data",
“姓名”：“纽约时报”
}
],
“异常情况”：[]
},
“死亡”：{
“资料来源”：[
{
“类型”：“纽约时报”，
“url”：”https://github.com/nytimes/covid-19-data",
“姓名”：“纽约时报”
}
],
“异常情况”：[]
},
“实证主义者”：空，
“否定测试”：空，
“contactTracers”：空，
“医院病床”：空，
“icuBeds”：空，
“newCases”：空，
“新死亡”：空，
“已分配疫苗”：无效，
“疫苗接种启动”：空，
“疫苗接种完成”：{
“资料来源”：[
{
“类型”：“其他”，
“url”：”https://covid.cdc.gov/covid-data-tracker/#county-视图“，
“名称”：“疾病控制和预防中心”
}
],
“异常情况”：[]
},
“接种者”：无效，
“testPositivityRatio”：空，
“案件密度”：{
“资料来源”：[
{
“类型”：“纽约时报”，
“url”：”https://github.com/nytimes/covid-19-data",
“姓名”：“纽约时报”
}
],
“异常情况”：[]
},
“contactTracerCapacityRatio”：空，
“感染率”：{
“资料来源”：[
{
“类型”：“纽约时报”，
“url”：”https://github.com/nytimes/covid-19-data",
“姓名”：“纽约时报”
}
],
“异常情况”：[]
},
“感染率90”：{
“资料来源”：[
{
“类型”：“纽约时报”，
“url”：”https://github.com/nytimes/covid-19-data",
“姓名”：“纽约时报”
}
],
“异常情况”：[]
},
“icuHeadroomRatio”：空，
“icuCapacityRatio”：空，
“疫苗接种启动比率”：空，
“疫苗接种完成比率”：空
},
“LastUpdateDate”：“2021-04-26”，
“url”：”https://covidactnow.org/us/alaska-ak/county/aleutians_east_borough"
}
]
const enteredCountryName=“美国”；
//使用filter方法从对象数组中获取所需的国家/地区名称
const countryArray=response.filter（item=>item.country===enteredCountryName）
const noofdeath=countryArray[0]。实际死亡人数。死亡人数；
const noOfCases=countryArray[0]。实际值。案例；
log（{noofdeath，noOfCases}）const响应=[
{
“fips”：“02013”，
“国家”：“美国”，
“国家”：
https://api.covidactnow.org/v2/county/{fips}.json?apiKey=YOUR_KEY_HERE