Question

我正在尝试浏览一些JSON数组，其中某些对象的大小可能会有所不同。 JSON片段太大而无法发布，因此我将其发布在JSON Blob上， HERE ，我正在尝试通过此结构并抓取其中一个具有最高值的对象属性。

在下面的图片中，我试图抓住＆＃34;冠军＆＃34; ＆＃34; totalSessionsPlayed＆＃34;中具有最高编号的对象。

enter image description here

我的问题是弄清楚如何循环，然后捕获总会话值，然后比较它们并最终检索具有最高总会话数的冠军对象。我习惯于总是硬编码值/路径，因为它总是静态地设置大小，而在这里大小可以改变。

我相信我需要做以下事情...但我不完全确定

json = JSON && JSON.parse(response) || $.parseJSON(response);

         $.each(json, function (i, el) {
                if (el.stats.totalSessionsPlayed > highestSession)
                {
                   highestSession = el.stats.totalSessionsPlayed...?
                }
          });
     //when done, somehow get the champion object that relates to that highestSession value.

我还是JSON的新手，我只是迷失了遍历这个动态大小的JSON。

Answer 1

创建阵列以保持顶级冠军（如果是平局则可以是多个）
循环通过冠军阵列
使用>获得totalSessionsPlayed值最高的冠军;并使用===确定是否已经有一个具有相同最高分的不同冠军。
如果是平局，请将当前冠军添加到阵列，否则使用新冠军创建新阵列。

解决方案代码：

var highestSession = -1; // set it low initially
var topChamps = []; // array since could be a N-way tie
$.each(json.champions, function(idx, champion) {
  if (champion.id > 0 && champion.stats) {
    if (champion.stats.totalSessionsPlayed > highestSession) {
      // new top score broke any possible ties
      topChamps = [champion]; // new array
      highestSession = champion.stats.totalSessionsPlayed; // save new max value
    } else if (champion.stats.totalSessionsPlayed === highestSession) {
      // it's a tie, add to list
      topChamps[topChamps.length] = champion;
    }
  }
});

针对OP的实际JSON数据运行此示例代码段：

// fake json for example only
var json = {
  "summonerId": 22421317,
  "modifyDate": 1414692614000,
  "champions": [{
    "id": 110,
    "stats": {
      "totalSessionsPlayed": 5,
      "totalSessionsLost": 5,
      "totalSessionsWon": 0,
      "totalChampionKills": 32,
      "totalDamageDealt": 725106,
      "totalDamageTaken": 113405,
      "mostChampionKillsPerSession": 13,
      "totalMinionKills": 937,
      "totalDoubleKills": 3,
      "totalTripleKills": 0,
      "totalQuadraKills": 0,
      "totalPentaKills": 0,
      "totalUnrealKills": 0,
      "totalDeathsPerSession": 52,
      "totalGoldEarned": 62141,
      "mostSpellsCast": 0,
      "totalTurretsKilled": 6,
      "totalPhysicalDamageDealt": 613669,
      "totalMagicDamageDealt": 105253,
      "totalFirstBlood": 0,
      "totalAssists": 55,
      "maxChampionsKilled": 13,
      "maxNumDeaths": 14
    }
  }, {
    "id": 21,
    "stats": {
      "totalSessionsPlayed": 7,
      "totalSessionsLost": 1,
      "totalSessionsWon": 6,
      "totalChampionKills": 54,
      "totalDamageDealt": 1143509,
      "totalDamageTaken": 132528,
      "mostChampionKillsPerSession": 18,
      "totalMinionKills": 1420,
      "totalDoubleKills": 7,
      "totalTripleKills": 1,
      "totalQuadraKills": 0,
      "totalPentaKills": 0,
      "totalUnrealKills": 0,
      "totalDeathsPerSession": 56,
      "totalGoldEarned": 99924,
      "mostSpellsCast": 0,
      "totalTurretsKilled": 24,
      "totalPhysicalDamageDealt": 973400,
      "totalMagicDamageDealt": 159071,
      "totalFirstBlood": 0,
      "totalAssists": 67,
      "maxChampionsKilled": 18,
      "maxNumDeaths": 11
    }
  }, {
    "id": 19,
    "stats": {
      "totalSessionsPlayed": 18,
      "totalSessionsLost": 9,
      "totalSessionsWon": 9,
      "totalChampionKills": 94,
      "totalDamageDealt": 1864380,
      "totalDamageTaken": 764921,
      "mostChampionKillsPerSession": 12,
      "totalMinionKills": 923,
      "totalDoubleKills": 3,
      "totalTripleKills": 0,
      "totalQuadraKills": 0,
      "totalPentaKills": 0,
      "totalUnrealKills": 0,
      "totalDeathsPerSession": 154,
      "totalGoldEarned": 212650,
      "mostSpellsCast": 0,
      "totalTurretsKilled": 14,
      "totalPhysicalDamageDealt": 932921,
      "totalMagicDamageDealt": 565418,
      "totalFirstBlood": 0,
      "totalAssists": 241,
      "maxChampionsKilled": 12,
      "maxNumDeaths": 12
    }
  }, {
    "id": 89,
    "stats": {
      "totalSessionsPlayed": 41,
      "totalSessionsLost": 15,
      "totalSessionsWon": 26,
      "totalChampionKills": 162,
      "totalDamageDealt": 1655899,
      "totalDamageTaken": 1322562,
      "mostChampionKillsPerSession": 12,
      "totalMinionKills": 1684,
      "totalDoubleKills": 6,
      "totalTripleKills": 1,
      "totalQuadraKills": 0,
      "totalPentaKills": 0,
      "totalUnrealKills": 0,
      "totalDeathsPerSession": 318,
      "totalGoldEarned": 447598,
      "mostSpellsCast": 0,
      "totalTurretsKilled": 16,
      "totalPhysicalDamageDealt": 434852,
      "totalMagicDamageDealt": 1042032,
      "totalFirstBlood": 0,
      "totalAssists": 716,
      "maxChampionsKilled": 12,
      "maxNumDeaths": 14
    }
  }, {
    "id": 9,
    "stats": {
      "totalSessionsPlayed": 1,
      "totalSessionsLost": 1,
      "totalSessionsWon": 0,
      "totalChampionKills": 14,
      "totalDamageDealt": 269323,
      "totalDamageTaken": 43294,
      "mostChampionKillsPerSession": 14,
      "totalMinionKills": 91,
      "totalDoubleKills": 2,
      "totalTripleKills": 0,
      "totalQuadraKills": 0,
      "totalPentaKills": 0,
      "totalUnrealKills": 0,
      "totalDeathsPerSession": 6,
      "totalGoldEarned": 18899,
      "mostSpellsCast": 0,
      "totalTurretsKilled": 1,
      "totalPhysicalDamageDealt": 17923,
      "totalMagicDamageDealt": 236252,
      "totalFirstBlood": 0,
      "totalAssists": 18,
      "maxChampionsKilled": 14,
      "maxNumDeaths": 6
    }
  }, {
    "id": 10,
    "stats": {
      "totalSessionsPlayed": 2,
      "totalSessionsLost": 1,
      "totalSessionsWon": 1,
      "totalChampionKills": 14,
      "totalDamageDealt": 229398,
      "totalDamageTaken": 50962,
      "mostChampionKillsPerSession": 13,
      "totalMinionKills": 250,
      "totalDoubleKills": 2,
      "totalTripleKills": 0,
      "totalQuadraKills": 0,
      "totalPentaKills": 0,
      "totalUnrealKills": 0,
      "totalDeathsPerSession": 16,
      "totalGoldEarned": 22793,
      "mostSpellsCast": 0,
      "totalTurretsKilled": 3,
      "totalPhysicalDamageDealt": 69735,
      "totalMagicDamageDealt": 157448,
      "totalFirstBlood": 0,
      "totalAssists": 12,
      "maxChampionsKilled": 13,
      "maxNumDeaths": 12
    }
  }, {
    "id": 114,
    "stats": {
      "totalSessionsPlayed": 2,
      "totalSessionsLost": 0,
      "totalSessionsWon": 2,
      "totalChampionKills": 10,
      "totalDamageDealt": 216804,
      "totalDamageTaken": 38006,
      "mostChampionKillsPerSession": 6,
      "totalMinionKills": 334,
      "totalDoubleKills": 2,
      "totalTripleKills": 0,
      "totalQuadraKills": 0,
      "totalPentaKills": 0,
      "totalUnrealKills": 0,
      "totalDeathsPerSession": 12,
      "totalGoldEarned": 20796,
      "mostSpellsCast": 0,
      "totalTurretsKilled": 8,
      "totalPhysicalDamageDealt": 211956,
      "totalMagicDamageDealt": 2482,
      "totalFirstBlood": 0,
      "totalAssists": 9,
      "maxChampionsKilled": 6,
      "maxNumDeaths": 9
    }
  }, {
    "id": 50,
    "stats": {
      "totalSessionsPlayed": 1,
      "totalSessionsLost": 1,
      "totalSessionsWon": 0,
      "totalChampionKills": 7,
      "totalDamageDealt": 58537,
      "totalDamageTaken": 31729,
      "mostChampionKillsPerSession": 7,
      "totalMinionKills": 62,
      "totalDoubleKills": 1,
      "totalTripleKills": 0,
      "totalQuadraKills": 0,
      "totalPentaKills": 0,
      "totalUnrealKills": 0,
      "totalDeathsPerSession": 13,
      "totalGoldEarned": 8280,
      "mostSpellsCast": 0,
      "totalTurretsKilled": 0,
      "totalPhysicalDamageDealt": 11119,
      "totalMagicDamageDealt": 46016,
      "totalFirstBlood": 0,
      "totalAssists": 7,
      "maxChampionsKilled": 7,
      "maxNumDeaths": 13
    }
  }, {
    "id": 122,
    "stats": {
      "totalSessionsPlayed": 1,
      "totalSessionsLost": 0,
      "totalSessionsWon": 1,
      "totalChampionKills": 5,
      "totalDamageDealt": 102450,
      "totalDamageTaken": 21890,
      "mostChampionKillsPerSession": 5,
      "totalMinionKills": 142,
      "totalDoubleKills": 0,
      "totalTripleKills": 0,
      "totalQuadraKills": 0,
      "totalPentaKills": 0,
      "totalUnrealKills": 0,
      "totalDeathsPerSession": 4,
      "totalGoldEarned": 11038,
      "mostSpellsCast": 0,
      "totalTurretsKilled": 4,
      "totalPhysicalDamageDealt": 91836,
      "totalMagicDamageDealt": 7028,
      "totalFirstBlood": 0,
      "totalAssists": 9,
      "maxChampionsKilled": 5,
      "maxNumDeaths": 4
    }
  }, {
    "id": 33,
    "stats": {
      "totalSessionsPlayed": 9,
      "totalSessionsLost": 5,
      "totalSessionsWon": 4,
      "totalChampionKills": 30,
      "totalDamageDealt": 808061,
      "totalDamageTaken": 240939,
      "mostChampionKillsPerSession": 9,
      "totalMinionKills": 277,
      "totalDoubleKills": 3,
      "totalTripleKills": 0,
      "totalQuadraKills": 0,
      "totalPentaKills": 0,
      "totalUnrealKills": 0,
      "totalDeathsPerSession": 53,
      "totalGoldEarned": 82246,
      "mostSpellsCast": 0,
      "totalTurretsKilled": 2,
      "totalPhysicalDamageDealt": 263466,
      "totalMagicDamageDealt": 354351,
      "totalFirstBlood": 0,
      "totalAssists": 95,
      "maxChampionsKilled": 9,
      "maxNumDeaths": 11
    }
  }, {
    "id": 80,
    "stats": {
      "totalSessionsPlayed": 13,
      "totalSessionsLost": 8,
      "totalSessionsWon": 5,
      "totalChampionKills": 91,
      "totalDamageDealt": 1471756,
      "totalDamageTaken": 309620,
      "mostChampionKillsPerSession": 13,
      "totalMinionKills": 1757,
      "totalDoubleKills": 10,
      "totalTripleKills": 1,
      "totalQuadraKills": 0,
      "totalPentaKills": 0,
      "totalUnrealKills": 0,
      "totalDeathsPerSession": 125,
      "totalGoldEarned": 140885,
      "mostSpellsCast": 0,
      "totalTurretsKilled": 24,
      "totalPhysicalDamageDealt": 1372131,
      "totalMagicDamageDealt": 84732,
      "totalFirstBlood": 0,
      "totalAssists": 83,
      "maxChampionsKilled": 13,
      "maxNumDeaths": 19
    }
  }, {
    "id": 63,
    "stats": {
      "totalSessionsPlayed": 1,
      "totalSessionsLost": 0,
      "totalSessionsWon": 1,
      "totalChampionKills": 7,
      "totalDamageDealt": 84633,
      "totalDamageTaken": 10389,
      "mostChampionKillsPerSession": 7,
      "totalMinionKills": 98,
      "totalDoubleKills": 1,
      "totalTripleKills": 0,
      "totalQuadraKills": 0,
      "totalPentaKills": 0,
      "totalUnrealKills": 0,
      "totalDeathsPerSession": 2,
      "totalGoldEarned": 9926,
      "mostSpellsCast": 0,
      "totalTurretsKilled": 0,
      "totalPhysicalDamageDealt": 16719,
      "totalMagicDamageDealt": 66391,
      "totalFirstBlood": 0,
      "totalAssists": 6,
      "maxChampionsKilled": 7,
      "maxNumDeaths": 2
    }
  }, {
    "id": 32,
    "stats": {
      "totalSessionsPlayed": 17,
      "totalSessionsLost": 9,
      "totalSessionsWon": 8,
      "totalChampionKills": 100,
      "totalDamageDealt": 2324822,
      "totalDamageTaken": 511432,
      "mostChampionKillsPerSession": 13,
      "totalMinionKills": 830,
      "totalDoubleKills": 9,
      "totalTripleKills": 1,
      "totalQuadraKills": 0,
      "totalPentaKills": 0,
      "totalUnrealKills": 0,
      "totalDeathsPerSession": 117,
      "totalGoldEarned": 194949,
      "mostSpellsCast": 0,
      "totalTurretsKilled": 0,
      "totalPhysicalDamageDealt": 249779,
      "totalMagicDamageDealt": 1833229,
      "totalFirstBlood": 0,
      "totalAssists": 208,
      "maxChampionsKilled": 13,
      "maxNumDeaths": 10
    }
  }, {
    "id": 31,
    "stats": {
      "totalSessionsPlayed": 11,
      "totalSessionsLost": 6,
      "totalSessionsWon": 5,
      "totalChampionKills": 73,
      "totalDamageDealt": 1565889,
      "totalDamageTaken": 346947,
      "mostChampionKillsPerSession": 16,
      "totalMinionKills": 667,
      "totalDoubleKills": 4,
      "totalTripleKills": 1,
      "totalQuadraKills": 0,
      "totalPentaKills": 0,
      "totalUnrealKills": 0,
      "totalDeathsPerSession": 59,
      "totalGoldEarned": 122954,
      "mostSpellsCast": 0,
      "totalTurretsKilled": 4,
      "totalPhysicalDamageDealt": 299979,
      "totalMagicDamageDealt": 940284,
      "totalFirstBlood": 0,
      "totalAssists": 98,
      "maxChampionsKilled": 16,
      "maxNumDeaths": 8
    }
  }, {
    "id": 0,
    "stats": {
      "totalSessionsPlayed": 129,
      "totalSessionsLost": 61,
      "totalSessionsWon": 68,
      "totalChampionKills": 693,
      "killingSpree": 285,
      "totalDamageDealt": 12520567,
      "totalDamageTaken": 3938624,
      "mostChampionKillsPerSession": 18,
      "totalMinionKills": 9472,
      "totalDoubleKills": 53,
      "totalTripleKills": 5,
      "totalQuadraKills": 0,
      "totalPentaKills": 0,
      "totalUnrealKills": 0,
      "totalDeathsPerSession": 987,
      "totalGoldEarned": 1455079,
      "mostSpellsCast": 0,
      "totalTurretsKilled": 106,
      "totalPhysicalDamageDealt": 5559485,
      "totalMagicDamageDealt": 5599987,
      "totalNeutralMinionsKilled": 3748,
      "totalFirstBlood": 0,
      "totalAssists": 1624,
      "totalHeal": 601627,
      "maxLargestKillingSpree": 9,
      "maxLargestCriticalStrike": 925,
      "maxChampionsKilled": 18,
      "maxNumDeaths": 19,
      "maxTimePlayed": 3633,
      "maxTimeSpentLiving": 1504,
      "normalGamesPlayed": 0,
      "rankedSoloGamesPlayed": 0,
      "rankedPremadeGamesPlayed": 0,
      "botGamesPlayed": 0
    }
  }]
}

var highestSession = -1; // set it low initially
var topChamps = []; // array since could be a N-way tie
$.each(json.champions, function(idx, champion) {
  if (champion.id > 0 && champion.stats) {
    if (champion.stats.totalSessionsPlayed > highestSession) {
      // new top score broke any possible ties
      topChamps = [champion];
      highestSession = champion.stats.totalSessionsPlayed; // save new max value
    } else if (champion.stats.totalSessionsPlayed === highestSession) {
      // it's a tie, add to list
      topChamps[topChamps.length] = champion;
    }
  }
});

$(document.body).append("<div>TOP CHAMP ID(s): " + topChamps.map(function(champ) {
  return champ.id
}).join(", ") + "</div>");

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

Answer 2

您需要做的只是减少阵列。您根本不需要jQuery，因为forEach，map和reduce是JavaScript中内置于Arrays的基本本机操作。

var bestChamp = json.champions.reduce(function (prev, next) {
    if (prev.stats.totalSessionsPlayed >= next.stats.totalSessionsPlayed) {
        return prev;
    } else {
        return next;
    }
});

// bestChamp contains the object

reduce将数组转换为单个值/对象。因此，在这种情况下，我们将champions数组转换为一个对象，其中totalSessionsPlayed的数量最多。

您可以阅读有关Array.prototype.reduce on MDN

的更多信息

如果您还想要使用id = 0排除对象，那么就像将此条件添加到if语句一样简单：

var bestChamp = json.champions.reduce(function (prev, next) {
    if (next.id === 0) {
        return prev;
    }

    if (prev.stats.totalSessionsPlayed >= next.stats.totalSessionsPlayed) {
        return prev;
    } else {
        return next;
    }
});

// bestChamp contains the object

以下是整个片段：

var json = {
  "summonerId": 22421317,
  "modifyDate": 1414692614000,
  "champions": [
    {
      "id": 110,
      "stats": {
        "totalSessionsPlayed": 5,
        "totalSessionsLost": 5,
        "totalSessionsWon": 0,
        "totalChampionKills": 32,
        "totalDamageDealt": 725106,
        "totalDamageTaken": 113405,
        "mostChampionKillsPerSession": 13,
        "totalMinionKills": 937,
        "totalDoubleKills": 3,
        "totalTripleKills": 0,
        "totalQuadraKills": 0,
        "totalPentaKills": 0,
        "totalUnrealKills": 0,
        "totalDeathsPerSession": 52,
        "totalGoldEarned": 62141,
        "mostSpellsCast": 0,
        "totalTurretsKilled": 6,
        "totalPhysicalDamageDealt": 613669,
        "totalMagicDamageDealt": 105253,
        "totalFirstBlood": 0,
        "totalAssists": 55,
        "maxChampionsKilled": 13,
        "maxNumDeaths": 14
      }
    },
    {
      "id": 21,
      "stats": {
        "totalSessionsPlayed": 7,
        "totalSessionsLost": 1,
        "totalSessionsWon": 6,
        "totalChampionKills": 54,
        "totalDamageDealt": 1143509,
        "totalDamageTaken": 132528,
        "mostChampionKillsPerSession": 18,
        "totalMinionKills": 1420,
        "totalDoubleKills": 7,
        "totalTripleKills": 1,
        "totalQuadraKills": 0,
        "totalPentaKills": 0,
        "totalUnrealKills": 0,
        "totalDeathsPerSession": 56,
        "totalGoldEarned": 99924,
        "mostSpellsCast": 0,
        "totalTurretsKilled": 24,
        "totalPhysicalDamageDealt": 973400,
        "totalMagicDamageDealt": 159071,
        "totalFirstBlood": 0,
        "totalAssists": 67,
        "maxChampionsKilled": 18,
        "maxNumDeaths": 11
      }
    },
    {
      "id": 19,
      "stats": {
        "totalSessionsPlayed": 18,
        "totalSessionsLost": 9,
        "totalSessionsWon": 9,
        "totalChampionKills": 94,
        "totalDamageDealt": 1864380,
        "totalDamageTaken": 764921,
        "mostChampionKillsPerSession": 12,
        "totalMinionKills": 923,
        "totalDoubleKills": 3,
        "totalTripleKills": 0,
        "totalQuadraKills": 0,
        "totalPentaKills": 0,
        "totalUnrealKills": 0,
        "totalDeathsPerSession": 154,
        "totalGoldEarned": 212650,
        "mostSpellsCast": 0,
        "totalTurretsKilled": 14,
        "totalPhysicalDamageDealt": 932921,
        "totalMagicDamageDealt": 565418,
        "totalFirstBlood": 0,
        "totalAssists": 241,
        "maxChampionsKilled": 12,
        "maxNumDeaths": 12
      }
    },
    {
      "id": 89,
      "stats": {
        "totalSessionsPlayed": 41,
        "totalSessionsLost": 15,
        "totalSessionsWon": 26,
        "totalChampionKills": 162,
        "totalDamageDealt": 1655899,
        "totalDamageTaken": 1322562,
        "mostChampionKillsPerSession": 12,
        "totalMinionKills": 1684,
        "totalDoubleKills": 6,
        "totalTripleKills": 1,
        "totalQuadraKills": 0,
        "totalPentaKills": 0,
        "totalUnrealKills": 0,
        "totalDeathsPerSession": 318,
        "totalGoldEarned": 447598,
        "mostSpellsCast": 0,
        "totalTurretsKilled": 16,
        "totalPhysicalDamageDealt": 434852,
        "totalMagicDamageDealt": 1042032,
        "totalFirstBlood": 0,
        "totalAssists": 716,
        "maxChampionsKilled": 12,
        "maxNumDeaths": 14
      }
    },
    {
      "id": 9,
      "stats": {
        "totalSessionsPlayed": 1,
        "totalSessionsLost": 1,
        "totalSessionsWon": 0,
        "totalChampionKills": 14,
        "totalDamageDealt": 269323,
        "totalDamageTaken": 43294,
        "mostChampionKillsPerSession": 14,
        "totalMinionKills": 91,
        "totalDoubleKills": 2,
        "totalTripleKills": 0,
        "totalQuadraKills": 0,
        "totalPentaKills": 0,
        "totalUnrealKills": 0,
        "totalDeathsPerSession": 6,
        "totalGoldEarned": 18899,
        "mostSpellsCast": 0,
        "totalTurretsKilled": 1,
        "totalPhysicalDamageDealt": 17923,
        "totalMagicDamageDealt": 236252,
        "totalFirstBlood": 0,
        "totalAssists": 18,
        "maxChampionsKilled": 14,
        "maxNumDeaths": 6
      }
    },
    {
      "id": 10,
      "stats": {
        "totalSessionsPlayed": 2,
        "totalSessionsLost": 1,
        "totalSessionsWon": 1,
        "totalChampionKills": 14,
        "totalDamageDealt": 229398,
        "totalDamageTaken": 50962,
        "mostChampionKillsPerSession": 13,
        "totalMinionKills": 250,
        "totalDoubleKills": 2,
        "totalTripleKills": 0,
        "totalQuadraKills": 0,
        "totalPentaKills": 0,
        "totalUnrealKills": 0,
        "totalDeathsPerSession": 16,
        "totalGoldEarned": 22793,
        "mostSpellsCast": 0,
        "totalTurretsKilled": 3,
        "totalPhysicalDamageDealt": 69735,
        "totalMagicDamageDealt": 157448,
        "totalFirstBlood": 0,
        "totalAssists": 12,
        "maxChampionsKilled": 13,
        "maxNumDeaths": 12
      }
    },
    {
      "id": 114,
      "stats": {
        "totalSessionsPlayed": 2,
        "totalSessionsLost": 0,
        "totalSessionsWon": 2,
        "totalChampionKills": 10,
        "totalDamageDealt": 216804,
        "totalDamageTaken": 38006,
        "mostChampionKillsPerSession": 6,
        "totalMinionKills": 334,
        "totalDoubleKills": 2,
        "totalTripleKills": 0,
        "totalQuadraKills": 0,
        "totalPentaKills": 0,
        "totalUnrealKills": 0,
        "totalDeathsPerSession": 12,
        "totalGoldEarned": 20796,
        "mostSpellsCast": 0,
        "totalTurretsKilled": 8,
        "totalPhysicalDamageDealt": 211956,
        "totalMagicDamageDealt": 2482,
        "totalFirstBlood": 0,
        "totalAssists": 9,
        "maxChampionsKilled": 6,
        "maxNumDeaths": 9
      }
    },
    {
      "id": 50,
      "stats": {
        "totalSessionsPlayed": 1,
        "totalSessionsLost": 1,
        "totalSessionsWon": 0,
        "totalChampionKills": 7,
        "totalDamageDealt": 58537,
        "totalDamageTaken": 31729,
        "mostChampionKillsPerSession": 7,
        "totalMinionKills": 62,
        "totalDoubleKills": 1,
        "totalTripleKills": 0,
        "totalQuadraKills": 0,
        "totalPentaKills": 0,
        "totalUnrealKills": 0,
        "totalDeathsPerSession": 13,
        "totalGoldEarned": 8280,
        "mostSpellsCast": 0,
        "totalTurretsKilled": 0,
        "totalPhysicalDamageDealt": 11119,
        "totalMagicDamageDealt": 46016,
        "totalFirstBlood": 0,
        "totalAssists": 7,
        "maxChampionsKilled": 7,
        "maxNumDeaths": 13
      }
    },
    {
      "id": 122,
      "stats": {
        "totalSessionsPlayed": 1,
        "totalSessionsLost": 0,
        "totalSessionsWon": 1,
        "totalChampionKills": 5,
        "totalDamageDealt": 102450,
        "totalDamageTaken": 21890,
        "mostChampionKillsPerSession": 5,
        "totalMinionKills": 142,
        "totalDoubleKills": 0,
        "totalTripleKills": 0,
        "totalQuadraKills": 0,
        "totalPentaKills": 0,
        "totalUnrealKills": 0,
        "totalDeathsPerSession": 4,
        "totalGoldEarned": 11038,
        "mostSpellsCast": 0,
        "totalTurretsKilled": 4,
        "totalPhysicalDamageDealt": 91836,
        "totalMagicDamageDealt": 7028,
        "totalFirstBlood": 0,
        "totalAssists": 9,
        "maxChampionsKilled": 5,
        "maxNumDeaths": 4
      }
    },
    {
      "id": 33,
      "stats": {
        "totalSessionsPlayed": 9,
        "totalSessionsLost": 5,
        "totalSessionsWon": 4,
        "totalChampionKills": 30,
        "totalDamageDealt": 808061,
        "totalDamageTaken": 240939,
        "mostChampionKillsPerSession": 9,
        "totalMinionKills": 277,
        "totalDoubleKills": 3,
        "totalTripleKills": 0,
        "totalQuadraKills": 0,
        "totalPentaKills": 0,
        "totalUnrealKills": 0,
        "totalDeathsPerSession": 53,
        "totalGoldEarned": 82246,
        "mostSpellsCast": 0,
        "totalTurretsKilled": 2,
        "totalPhysicalDamageDealt": 263466,
        "totalMagicDamageDealt": 354351,
        "totalFirstBlood": 0,
        "totalAssists": 95,
        "maxChampionsKilled": 9,
        "maxNumDeaths": 11
      }
    },
    {
      "id": 80,
      "stats": {
        "totalSessionsPlayed": 13,
        "totalSessionsLost": 8,
        "totalSessionsWon": 5,
        "totalChampionKills": 91,
        "totalDamageDealt": 1471756,
        "totalDamageTaken": 309620,
        "mostChampionKillsPerSession": 13,
        "totalMinionKills": 1757,
        "totalDoubleKills": 10,
        "totalTripleKills": 1,
        "totalQuadraKills": 0,
        "totalPentaKills": 0,
        "totalUnrealKills": 0,
        "totalDeathsPerSession": 125,
        "totalGoldEarned": 140885,
        "mostSpellsCast": 0,
        "totalTurretsKilled": 24,
        "totalPhysicalDamageDealt": 1372131,
        "totalMagicDamageDealt": 84732,
        "totalFirstBlood": 0,
        "totalAssists": 83,
        "maxChampionsKilled": 13,
        "maxNumDeaths": 19
      }
    },
    {
      "id": 63,
      "stats": {
        "totalSessionsPlayed": 1,
        "totalSessionsLost": 0,
        "totalSessionsWon": 1,
        "totalChampionKills": 7,
        "totalDamageDealt": 84633,
        "totalDamageTaken": 10389,
        "mostChampionKillsPerSession": 7,
        "totalMinionKills": 98,
        "totalDoubleKills": 1,
        "totalTripleKills": 0,
        "totalQuadraKills": 0,
        "totalPentaKills": 0,
        "totalUnrealKills": 0,
        "totalDeathsPerSession": 2,
        "totalGoldEarned": 9926,
        "mostSpellsCast": 0,
        "totalTurretsKilled": 0,
        "totalPhysicalDamageDealt": 16719,
        "totalMagicDamageDealt": 66391,
        "totalFirstBlood": 0,
        "totalAssists": 6,
        "maxChampionsKilled": 7,
        "maxNumDeaths": 2
      }
    },
    {
      "id": 32,
      "stats": {
        "totalSessionsPlayed": 17,
        "totalSessionsLost": 9,
        "totalSessionsWon": 8,
        "totalChampionKills": 100,
        "totalDamageDealt": 2324822,
        "totalDamageTaken": 511432,
        "mostChampionKillsPerSession": 13,
        "totalMinionKills": 830,
        "totalDoubleKills": 9,
        "totalTripleKills": 1,
        "totalQuadraKills": 0,
        "totalPentaKills": 0,
        "totalUnrealKills": 0,
        "totalDeathsPerSession": 117,
        "totalGoldEarned": 194949,
        "mostSpellsCast": 0,
        "totalTurretsKilled": 0,
        "totalPhysicalDamageDealt": 249779,
        "totalMagicDamageDealt": 1833229,
        "totalFirstBlood": 0,
        "totalAssists": 208,
        "maxChampionsKilled": 13,
        "maxNumDeaths": 10
      }
    },
    {
      "id": 31,
      "stats": {
        "totalSessionsPlayed": 11,
        "totalSessionsLost": 6,
        "totalSessionsWon": 5,
        "totalChampionKills": 73,
        "totalDamageDealt": 1565889,
        "totalDamageTaken": 346947,
        "mostChampionKillsPerSession": 16,
        "totalMinionKills": 667,
        "totalDoubleKills": 4,
        "totalTripleKills": 1,
        "totalQuadraKills": 0,
        "totalPentaKills": 0,
        "totalUnrealKills": 0,
        "totalDeathsPerSession": 59,
        "totalGoldEarned": 122954,
        "mostSpellsCast": 0,
        "totalTurretsKilled": 4,
        "totalPhysicalDamageDealt": 299979,
        "totalMagicDamageDealt": 940284,
        "totalFirstBlood": 0,
        "totalAssists": 98,
        "maxChampionsKilled": 16,
        "maxNumDeaths": 8
      }
    },
    {
      "id": 0,
      "stats": {
        "totalSessionsPlayed": 129,
        "totalSessionsLost": 61,
        "totalSessionsWon": 68,
        "totalChampionKills": 693,
        "killingSpree": 285,
        "totalDamageDealt": 12520567,
        "totalDamageTaken": 3938624,
        "mostChampionKillsPerSession": 18,
        "totalMinionKills": 9472,
        "totalDoubleKills": 53,
        "totalTripleKills": 5,
        "totalQuadraKills": 0,
        "totalPentaKills": 0,
        "totalUnrealKills": 0,
        "totalDeathsPerSession": 987,
        "totalGoldEarned": 1455079,
        "mostSpellsCast": 0,
        "totalTurretsKilled": 106,
        "totalPhysicalDamageDealt": 5559485,
        "totalMagicDamageDealt": 5599987,
        "totalNeutralMinionsKilled": 3748,
        "totalFirstBlood": 0,
        "totalAssists": 1624,
        "totalHeal": 601627,
        "maxLargestKillingSpree": 9,
        "maxLargestCriticalStrike": 925,
        "maxChampionsKilled": 18,
        "maxNumDeaths": 19,
        "maxTimePlayed": 3633,
        "maxTimeSpentLiving": 1504,
        "normalGamesPlayed": 0,
        "rankedSoloGamesPlayed": 0,
        "rankedPremadeGamesPlayed": 0,
        "botGamesPlayed": 0
      }
    }
  ]
}

var bestChamp = json.champions.reduce(function (prev, next) {
    if (next.id === 0) {
        return prev;
    }

    if (prev.stats.totalSessionsPlayed >= next.stats.totalSessionsPlayed) {
        return prev;
    } else {
        return next;
    }
});

alert(bestChamp.id);

Answer 3

如果你正在寻找更简单的东西，你可以考虑这个：

json.champions.reduce(function(current, champ) {
    return champ.stats.totalSessionsPlayed > current.stats.totalSessionsPlayed
            ? champ : current;
});

它没有在@nothingisnecessary的答案中进行错误检查，也没有允许联系的可能性，只选择总数最高的第一个。但它的代码非常简单。

使用动态（更改）数组大小跟踪JSON字符串

3 个答案: