javascript - 一个团队的所有目标的数量（来自 JSON）

Question

我有一个包含足球比赛数据的 JSON 文件

[
   {
      "game_id":"258716",
      "game_date_start":"2016-08-15",
      "season": "2016",
      "team_1_id":"119",
      "team_2_id":"120",      
      "team_1_goals_quantity":"2",
      "team_2_goals_quantity":"1",         
   },
   {
      "game_id":"258717",
      "game_date_start":"2016-09-15",
      "season": "2016",
      "team_1_id":"119",
      "team_2_id":"122",      
      "team_1_goals_quantity":"1",
      "team_2_goals_quantity":"1"     
   },
   {
      "game_id":"258718",
      "game_date_start":"2016-07-15",
      "season": "2016",
      "team_1_id":"121",
      "team_2_id":"119",     
      "team_1_goals_quantity":"1",
      "team_2_goals_quantity":"1"      
   }
]

任务1。计算每支球队的比赛总数

任务 #2。计算球队的总进球数（在所有比赛中）

我正在使用 Vue.js。我以这种方式解决了任务＃1：

 countGames() {     
            var data = this.$store.getters.games; 
            var arr1 = []; 
            var obj1 = {}; 

            //Here I got all unique Team IDs
            function getMatches() { 
                    for (var i in data) {        
                          obj1[data[i].team_1_id] = (obj1[data[i].team_1_id] || 0) + 1;
                          obj1[data[i].team_2_id] = (obj1[data[i].team_2_id] || 0) + 1
                    };      
                    Object.keys(obj1).forEach(function(el, data) {
                        arr1.push( [ el, obj1[el]] );                       
                    });                          
                 }; 
            getMatches();          
            var result = arr1.map(
                  ([team_id, matches]) => ({team_id, matches}) //here I got { {team_id: "119", matches: 3}, {team_id: "120", matches: 1} ... }
            );
            return result;                 
        }  

有用。但我不知道如何解决任务 #2 - 计算每支球队在所有比赛中的总进球数。问题在于，有时团队的唯一 ID 可能位于 team_1_id，有时位于 team_2_id（如 JSON 示例中的团队“119”i）。

请帮我写这个脚本。

标签： javascriptjsonvue.js

Answer 1

您可以映射数组的每个对象并增加相应的计数器以获取您的数据，如下所示：

    let totalGames = {},
        totalGoals = {};

    data.map( game => {

        //count games team 1
        if (!totalGames.hasOwnProperty(game.team_1_id)) {
            totalGames[game.team_1_id] = 1;
        } else {
            totalGames[game.team_1_id] += 1;
        }
        //count games team 2
        if (!totalGames.hasOwnProperty(game.team_2_id)) {
            totalGames[game.team_2_id] = 1;
        } else {
            totalGames[game.team_2_id] += 1;
        }

        //count goals team 1
        if (!totalGoals.hasOwnProperty(game.team_1_id)) {
            totalGoals[game.team_1_id] = parseInt(game.team_1_goals_quantity);
        } else {
            totalGoals[game.team_1_id] += parseInt(game.team_1_goals_quantity);
        }

        //count goals team 2
        if (!totalGoals.hasOwnProperty(game.team_2_id)) {
            totalGoals[game.team_2_id] = parseInt(game.team_2_goals_quantity);
        } else {
            totalGoals[game.team_2_id] += parseInt(game.team_2_goals_quantity);
        }
    });