javascript - 谁能帮我简化一下？

Question

var GAME1NUM = "";
if (json.participantIdentities[0].player.summonerName == ACTUALNAME) {
  var GAME1NUM = 0;
} else if (json.participantIdentities[1].player.summonerName == ACTUALNAME) {
  var GAME1NUM = 1;
} else if (json.participantIdentities[2].player.summonerName == ACTUALNAME) {
  var GAME1NUM = 2;
} else if (json.participantIdentities[3].player.summonerName == ACTUALNAME) {
  var GAME1NUM = 3;
} else if (json.participantIdentities[4].player.summonerName == ACTUALNAME) {
  var GAME1NUM = 4;
} else if (json.participantIdentities[5].player.summonerName == ACTUALNAME) {
  var GAME1NUM = 5;
} else if (json.participantIdentities[6].player.summonerName == ACTUALNAME) {
  var GAME1NUM = 6;
} else if (json.participantIdentities[7].player.summonerName == ACTUALNAME) {
  var GAME1NUM = 7;
} else if (json.participantIdentities[8].player.summonerName == ACTUALNAME) {
  var GAME1NUM = 8;
} else if (json.participantIdentities[9].player.summonerName == ACTUALNAME) {
  var GAME1NUM = 9;
}

需要帮助简化感觉重复的代码

真的请帮忙，如果你不帮忙也没关系，但如果你能请伙计

Answer 1

使用Array#findIndex来自 ES6:

var GAME1NUM = json.participantIdentities.findIndex(function(val) {
    return val.player.summonerName === ACTUALNAME;
});

如果您需要更多浏览器兼容性，请使用polyfill .