Javascript 查找对象中值翻倍所需的天数
我正在用JavaScript制作一个包含最新冠状病毒病例数的表格，现在我想创建一个列，显示确认病例数翻倍所需的天数。以下是一个例子：Javascript 查找对象中值翻倍所需的天数,javascript,arrays,json,object,Javascript,Arrays,Json,Object,我正在用JavaScript制作一个包含最新冠状病毒病例数的表格，现在我想创建一个列，显示确认病例数翻倍所需的天数。以下是一个例子： { "message": "Success", "source": "JHU CSSE", "sourceURL": "https://github.com/CSSEGISandData/2019-nCoV", "updateDate": "2020-03-22T11:08:41.651Z", "data": { "3/15/20":
{
"message": "Success",
"source": "JHU CSSE",
"sourceURL": "https://github.com/CSSEGISandData/2019-nCoV",
"updateDate": "2020-03-22T11:08:41.651Z",
"data": {
"3/15/20": {
"Afghanistan": 16,
"Albania": 42,
"Algeria": 48,
"Andorra": 1,
"Angola": 0,
"Antigua and Barbuda": 1,
"Argentina": 45,
"Armenia": 26,
"Australia": 297,
"Austria": 860,
"Azerbaijan": 23,
"Bahamas, The": 0,
"Bahrain": 214,
"Bangladesh": 5,
"Barbados": 0,
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"Belgium": 886,
"Benin": 0,
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"Central African Republic": 1,
"Chad": 0,
"Chile": 74,
"China": 81003,
"Colombia": 34,
"Congo (Brazzaville)": 1,
"Congo (Kinshasa)": 2,
"Costa Rica": 27,
"Cote d'Ivoire": 1,
"Croatia": 49,
"Cruise Ship": 696,
"Cuba": 4,
"Cyprus": 26,
"Czechia": 253,
"Denmark": 875,
"Djibouti": 0,
"Dominican Republic": 11,
"East Timor": 0,
"Ecuador": 28,
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"El Salvador": 0,
"Equatorial Guinea": 1,
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"Eswatini": 1,
"Ethiopia": 1,
"Fiji": 0,
"Finland": 244,
"France": 4523,
"Gabon": 1,
"Gambia, The": 0,
"Georgia": 33,
"Germany": 5795,
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},
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},
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"Colombia": 128,
"Congo (Brazzaville)": 3,
"Congo (Kinshasa)": 18,
"Costa Rica": 89,
"Cote d'Ivoire": 9,
"Croatia": 128,
"Cruise Ship": 712,
"Cuba": 16,
"Cyprus": 67,
"Czechia": 833,
"Denmark": 1337,
"Djibouti": 1,
"Dominican Republic": 72,
"East Timor": 0,
"Ecuador": 367,
"Egypt": 285,
"El Salvador": 1,
"Equatorial Guinea": 6,
"Eritrea": 0,
"Estonia": 283,
"Eswatini": 1,
"Ethiopia": 9,
"Fiji": 1,
"Finland": 450,
"France": 12726,
"Gabon": 3,
"Gambia, The": 1,
"Georgia": 43,
"Germany": 19848,
"Ghana": 16,
"Greece": 495,
"Guatemala": 12,
"Guinea": 1,
"Guyana": 7,
"Haiti": 2,
"Holy See": 1,
"Honduras": 24,
"Hungary": 85,
"Iceland": 409,
"India": 244,
"Indonesia": 369,
"Iran": 19644,
"Iraq": 208,
"Ireland": 683,
"Israel": 705,
"Italy": 47021,
"Jamaica": 16,
"Japan": 963,
"Jordan": 85,
"Kazakhstan": 49,
"Kenya": 7,
"Korea, South": 8652,
"Kosovo": 2,
"Kuwait": 159,
"Kyrgyzstan": 6,
"Latvia": 111,
"Lebanon": 163,
"Liberia": 2,
"Liechtenstein": 28,
"Lithuania": 49,
"Luxembourg": 484,
"Madagascar": 3,
"Malaysia": 1030,
"Maldives": 13,
"Malta": 64,
"Martinique": 32,
"Mauritania": 2,
"Mauritius": 12,
"Mexico": 164,
"Moldova": 66,
"Monaco": 11,
"Mongolia": 6,
"Montenegro": 14,
"Morocco": 77,
"Namibia": 3,
"Nepal": 1,
"Netherlands": 3003,
"New Zealand": 39,
"Nicaragua": 1,
"Niger": 1,
"Nigeria": 12,
"North Macedonia": 67,
"Norway": 1914,
"Oman": 48,
"Pakistan": 501,
"Panama": 137,
"Papua New Guinea": 1,
"Paraguay": 13,
"Peru": 234,
"Philippines": 230,
"Poland": 425,
"Portugal": 1020,
"Qatar": 470,
"Romania": 308,
"Russia": 253,
"Rwanda": 17,
"Saint Lucia": 2,
"Saint Vincent and the Grenadines": 1,
"San Marino": 144,
"Saudi Arabia": 344,
"Senegal": 38,
"Serbia": 135,
"Seychelles": 7,
"Singapore": 385,
"Slovakia": 137,
"Slovenia": 341,
"Somalia": 1,
"South Africa": 202,
"Spain": 20410,
"Sri Lanka": 73,
"Sudan": 2,
"Suriname": 4,
"Sweden": 1639,
"Switzerland": 5294,
"Taiwan*": 135,
"Tanzania": 6,
"Thailand": 322,
"Togo": 9,
"Trinidad and Tobago": 9,
"Tunisia": 54,
"Turkey": 359,
"US": 19100,
"Uganda": 0,
"Ukraine": 29,
"United Arab Emirates": 140,
"United Kingdom": 4014,
"Uruguay": 94,
"Uzbekistan": 33,
"Venezuela": 42,
"Vietnam": 91,
"Zambia": 2,
"Zimbabwe": 1
},
"3/21/20": {
"Afghanistan": 24,
"Albania": 76,
"Algeria": 139,
"Andorra": 88,
"Angola": 2,
"Antigua and Barbuda": 1,
"Argentina": 158,
"Armenia": 160,
"Australia": 1071,
"Austria": 2814,
"Azerbaijan": 53,
"Bahamas, The": 4,
"Bahrain": 305,
"Bangladesh": 25,
"Barbados": 6,
"Belarus": 76,
"Belgium": 2815,
"Benin": 2,
"Bhutan": 2,
"Bolivia": 19,
"Bosnia and Herzegovina": 93,
"Brazil": 1021,
"Brunei": 83,
"Bulgaria": 163,
"Burkina Faso": 64,
"Cabo Verde": 3,
"Cambodia": 53,
"Cameroon": 27,
"Canada": 1278,
"Cape Verde": 1,
"Central African Republic": 3,
"Chad": 1,
"Chile": 537,
"China": 81305,
"Colombia": 196,
"Congo (Brazzaville)": 3,
"Congo (Kinshasa)": 23,
"Costa Rica": 117,
"Cote d'Ivoire": 14,
"Croatia": 206,
"Cruise Ship": 712,
"Cuba": 21,
"Cyprus": 84,
"Czechia": 995,
"Denmark": 1420,
"Djibouti": 1,
"Dominican Republic": 112,
"East Timor": 1,
"Ecuador": 506,
"Egypt": 294,
"El Salvador": 3,
"Equatorial Guinea": 6,
"Eritrea": 1,
"Estonia": 306,
"Eswatini": 1,
"Ethiopia": 9,
"Fiji": 1,
"Finland": 523,
"France": 14431,
"Gabon": 4,
"Gambia, The": 1,
"Georgia": 49,
"Germany": 22213,
"Ghana": 19,
"Greece": 530,
"Guatemala": 17,
"Guinea": 2,
"Guyana": 7,
"Haiti": 2,
"Holy See": 1,
"Honduras": 24,
"Hungary": 103,
"Iceland": 473,
"India": 330,
"Indonesia": 450,
"Iran": 20610,
"Iraq": 214,
"Ireland": 785,
"Israel": 883,
"Italy": 53578,
"Jamaica": 16,
"Japan": 1007,
"Jordan": 85,
"Kazakhstan": 53,
"Kenya": 7,
"Korea, South": 8799,
"Kosovo": 2,
"Kuwait": 176,
"Kyrgyzstan": 14,
"Latvia": 124,
"Lebanon": 187,
"Liberia": 3,
"Liechtenstein": 37,
"Lithuania": 83,
"Luxembourg": 670,
"Madagascar": 3,
"Malaysia": 1183,
"Maldives": 13,
"Malta": 73,
"Martinique": 32,
"Mauritania": 2,
"Mauritius": 14,
"Mexico": 203,
"Moldova": 80,
"Monaco": 11,
"Mongolia": 10,
"Montenegro": 14,
"Morocco": 96,
"Namibia": 3,
"Nepal": 1,
"Netherlands": 3640,
"New Zealand": 52,
"Nicaragua": 2,
"Niger": 1,
"Nigeria": 22,
"North Macedonia": 85,
"Norway": 2118,
"Oman": 52,
"Pakistan": 730,
"Panama": 200,
"Papua New Guinea": 1,
"Paraguay": 18,
"Peru": 318,
"Philippines": 307,
"Poland": 536,
"Portugal": 1280,
"Qatar": 481,
"Romania": 367,
"Russia": 306,
"Rwanda": 17,
"Saint Lucia": 2,
"Saint Vincent and the Grenadines": 1,
"San Marino": 144,
"Saudi Arabia": 392,
"Senegal": 47,
"Serbia": 171,
"Seychelles": 7,
"Singapore": 432,
"Slovakia": 178,
"Slovenia": 383,
"Somalia": 1,
"South Africa": 240,
"Spain": 25374,
"Sri Lanka": 77,
"Sudan": 2,
"Suriname": 4,
"Sweden": 1763,
"Switzerland": 6575,
"Taiwan*": 153,
"Tanzania": 6,
"Thailand": 411,
"Togo": 16,
"Trinidad and Tobago": 49,
"Tunisia": 60,
"Turkey": 670,
"US": 25489,
"Uganda": 1,
"Ukraine": 47,
"United Arab Emirates": 153,
"United Kingdom": 5067,
"Uruguay": 110,
"Uzbekistan": 43,
"Venezuela": 70,
"Vietnam": 94,
"Zambia": 2,
"Zimbabwe": 3
}
}
}
它是否可以返回一个对象，其中显示每个国家的病例数翻一番需要多少天？维护受感染者的国家初始计数，然后在各个国家重复检查计数是否为初始计数的
两倍
// Store number of days
let days = 0;
const countriesWithDoubleDayCount = {};
const dates = Object.keys(data.data);
const countries = Object.values(data.data);
// Create any Object of countries with count set to zero
const groupByCountries = Object.keys(data.data["3/15/20"]).reduce((accu, name) => {
accu[name] = 0;
return accu;
}, {});
const initialCountCountryWise = {};
const doubleCount = countries.reduce((a, country, i) => {
if (i < dates.length - 1) {
// Date Difference Calculation
days += Math.abs((new Date(dates[i + 1]) - new Date(dates[i])) / (1000 * 60 * 60 * 24), 10);
}
const countries = Object.entries(country);
countries.forEach(([name, count]) => {
// First Record
if (i == 0) {
// Maintain the initial count of coronavirus infected people, country wise.
initialCountCountryWise[name] = count !== 0 ? count : 1;
}
a[name] = count;
const double = initialCountCountryWise[name] * 2;
// Check if current country count is greater than double of initial count
// If yes, push in the countriesWithDoubleDayCount Object.
if (a[name] >= double && !countriesWithDoubleDayCount.hasOwnProperty(name)) {
countriesWithDoubleDayCount[name] = days;
}
});
return a;
}, groupByCountries);
console.log(countriesWithDoubleDayCount);
//存储天数
设天数=0；
常数countriesWithDoubleDayCount={}；
const dates=Object.keys（data.data）；
const countries=对象值（data.data）；
//创建count设置为零的国家/地区的任何对象
const groupByCountries=Object.keys（data.data[“3/15/20”]）。reduce（（accu，name）=>{
accu[name]=0；
返回accu；
}, {});
const initialCountCountCountryWise={}；
const doubleCount=国家/地区。减少（（a，国家/地区，i）=>{
如果（i{
//第一记录
如果（i==0）{
//保持国家级冠状病毒感染者的初始计数。
initialCountCountCountryWise[name]=计数！==0？计数：1；
}
a[名称]=计数；
const double=initialCountCountCountryWise[name]*2；
//检查当前国家/地区计数是否大于初始计数的两倍
//如果是，则将Countries推入DoubleDayCount对象。
如果（a[name]>=double&&！countriesWithDoubleDayCount.hasOwnProperty（name））{
countriesWithDoubleDayCount[名称]=天；
}
});
返回a；
}，按国家分组）；
console.log（countriesWithDoubleDayCount）；
注意-由于字符限制，无法添加Javascript实时代码片段
维护受感染者的初始计数
，然后在各个国家进行迭代，检查计数是否为初始计数的两倍
// Store number of days
let days = 0;
const countriesWithDoubleDayCount = {};
const dates = Object.keys(data.data);
const countries = Object.values(data.data);
// Create any Object of countries with count set to zero
const groupByCountries = Object.keys(data.data["3/15/20"]).reduce((accu, name) => {
accu[name] = 0;
return accu;
}, {});
const initialCountCountryWise = {};
const doubleCount = countries.reduce((a, country, i) => {
if (i < dates.length - 1) {
// Date Difference Calculation
days += Math.abs((new Date(dates[i + 1]) - new Date(dates[i])) / (1000 * 60 * 60 * 24), 10);
}
const countries = Object.entries(country);
countries.forEach(([name, count]) => {
// First Record
if (i == 0) {
// Maintain the initial count of coronavirus infected people, country wise.
initialCountCountryWise[name] = count !== 0 ? count : 1;
}
a[name] = count;
const double = initialCountCountryWise[name] * 2;
// Check if current country count is greater than double of initial count
// If yes, push in the countriesWithDoubleDayCount Object.
if (a[name] >= double && !countriesWithDoubleDayCount.hasOwnProperty(name)) {
countriesWithDoubleDayCount[name] = days;
}
});
return a;
}, groupByCountries);
console.log(countriesWithDoubleDayCount);
//存储天数
设天数=0；
常数countriesWithDoubleDayCount={}；
const dates=Object.keys（data.data）；
const countries=对象值（data.data）；
//创建count设置为零的国家/地区的任何对象
const groupByCountries=Object.keys（data.data[“3/15/20”]）。reduce（（accu，name）=>{
accu[name]=0；
返回accu；
}, {});
const initialCountCountCountryWise={}；
const doubleCount=国家/地区。减少（（a，国家/地区，i）=>{
如果（i{
//第一记录
如果（i==0）{
//保持国家级冠状病毒感染者的初始计数。
initialCountCountCountryWise[name]=计数！==0？计数：1；
}
a[名称]=计数；
const double=initialCountCountCountryWise[name]*2；
//检查当前国家/地区计数是否大于初始计数的两倍
//如果是，则将Countries推入DoubleDayCount对象。
如果（a[name]>=double&&！countriesWithDoubleDayCount.hasOwnProperty（name））{
countriesWithDoubleDayCount[名称]=天；
}
});
返回a；
}，按国家分组）；
console.log（countriesWithDoubleDayCount）；
注意-由于字符限制，无法添加Javascript实时代码片段
漂亮的主题。我想知道这是关于什么的…？到目前为止您尝试了什么？应该是一个简单的2 for循环。你尝试过什么吗？我对javascript中的对象非常陌生，这完全是出于兴趣。如果我能得到一些我应该做什么的指导，这将是很有帮助的。很好的话题。我想知道这是关于什么的…？到目前为止你都尝试了什么？应该是一个简单的2 for循环。你尝试过什么吗？我对javascript中的对象非常陌生，这完全是出于兴趣。如果我能得到一些关于我应该做什么的指导，那会很有帮助。非常感谢，我现在开始对编码感兴趣了。非常感谢，我现在开始对编码感兴趣了。