我如何遍歷並向值添加鍵值

Question

我希望能夠遍歷此對象並將“鍵”值添加到值中，以便它可以輕松用於項目。 我正在從網站上抓取數據以獲取數據 我已經能夠獲取數據，但我需要對其進行格式化，這是我的代碼，我一直在思考下一步是什么。

我試圖讓它看起來像這樣

例子

• 服務器：“USSouth2”

• 費用：100

• 多少：56

• 時間：28

代碼

let options = {
    url: 'https://www.realmeye.com/items/misc/',
    headers: {
        'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/76.0.3809.100 Safari/537.36'
    }
}
var result = [];
request(options, function(err, resp, html) {
    if (!err) {

        const $ = cheerio.load(html);
        let servers = $('.cheapest-server').attr('data-alternatives');

        servers.forEach(function(nexus) {
            result.push({
                servername: nexus[0],
                cost: nexus[1],
                howmuch: nexus[2],
                time: nexus[3]
            })
        })
    }
})

JSON 對象（這可能會因網站數據而異）

["USSouth2 Nexus",100,56,28],["EUSouth Nexus",100,62,25],["AsiaSouthEast Nexus",100,58,25],["EUNorth2 Nexus",100,64,24],["EUEast Nexus",100,55,24],["USWest2 Nexus",100,73,23],["USMidWest2 Nexus",100,53,21],["USEast2 Nexus",100,98,17],["EUWest Nexus",100,66,11],["EUSouthWest Nexus",100,86,10],["USNorthWest Nexus",100,87,9],["USSouthWest Nexus",100,67,9],["EUWest2 Nexus",100,89,8],["USWest Nexus",100,66,8],["USSouth Nexus",100,54,7],["USMidWest Nexus",100,90,6],["USSouth3 Nexus",100,82,6],["USEast Nexus",100,65,1]]

我收到此錯誤TypeError: servers.forEach is not a function

Answer 1

我已經更新了代碼片段。 請立即檢查。

 let servers = [["USSouth2 Nexus",100,56,28],["EUSouth Nexus",100,62,25],["AsiaSouthEast Nexus",100,58,25],["EUNorth2 Nexus",100,64,24],["EUEast Nexus",100,55,24],["USWest2 Nexus",100,73,23],["USMidWest2 Nexus",100,53,21],["USEast2 Nexus",100,98,17],["EUWest Nexus",100,66,11],["EUSouthWest Nexus",100,86,10],["USNorthWest Nexus",100,87,9],["USSouthWest Nexus",100,67,9],["EUWest2 Nexus",100,89,8],["USWest Nexus",100,66,8],["USSouth Nexus",100,54,7],["USMidWest Nexus",100,90,6],["USSouth3 Nexus",100,82,6],["USEast Nexus",100,65,1]]; var result = []; servers.forEach(function(nexus) { result.push({ servername: nexus[0], cost: nexus[1], howmuch: nexus[2], time: nexus[3] }); }); console.log(result);

Answer 2

我已經修復它我忘了解析 JSON 這里是通過創建一個新變量的答案

let jsonData = JSON.parse(servers);

Answer 3

好的，所以如果你確定這四個鍵不會改變，那么做這樣的事情。

創建一個具有四個鍵的數組，按出現在單個 JSON 數組值中的順序。 使用數組的map方法遍歷數組並操作每個值，使用 the 和reduce方法將數組轉換為對象。

查看下面的示例以了解它的作用。

 // Your JSON. const json = [["USSouth2 Nexus",100,56,28], ["EUSouth Nexus",100,62,25]]; // The four keys of the object. In order of the JSON array. const keys = ['servername', 'cost', 'howmuch', 'time']; // Loop over servers and return an object reduces from an array. const servers = json.map(server => server.reduce((acc, cur, i) => { let key = keys[i]; acc[key]= cur; return acc; }, {})); console.log(servers);

Answer 4

首先，您需要檢查服務器是否已發送，如果是，則為數組 anf 的形式，然后遍歷服務器並獲取您的數據

const servers = $('.cheapest-server').attr('data-alternatives');

if (servers && Array.isArray(servers) && servers.length) {
  const result = [];
  for (let i = 0; i < servers.lenght; i += 1) {
    const entity = servers[i];
    const objBuilder = {
      servername: entity[0] || null,
      cost: entity[1] || null,
      howmuch: entity[2] || null,
      time: entity[3] || null,
    };  
    result.push(objBuilder);
  }
} else {
  // Error handling or pass an empty array
}