javascript - 将对象内的对象读取为未定义
问题描述
我正在尝试制作一款口袋妖怪风格的游戏,您可以在其中孵化和进化龙。大多数龙都进化成更强大的龙。
https://jsbin.com/pulawoz/15/edit?html,js,输出
当我创建“evolve”函数时,我遇到了麻烦。它总是将正在进化的龙 (dragonToEvolve) 的 evolutionsInto 属性读取为未定义。
您可以在此处查看问题代码:
var dragons = [];
var enemyDragon;
function Dragon(name, ATK, maxATK, HP, maxHP, normalPowers, continuousPowers,
responsePowers, type, cry, evolvesInto, numberOfAttacks) {
this.name = name;
this.ATK = ATK;
this.HP = HP;
this.maxATK = maxATK;
this.maxHP = maxHP;
this.normalPowers = normalPowers;
this.continuousPowers = continuousPowers;
this.responsePowers = responsePowers;
this.type = type;
this.cry = cry;
this.evolvesInto = evolvesInto;
this.numberOfAttacks = numberOfAttacks
}
// Dragons
var lusterDragon = new Dragon("Luster Dragon", 1900, 1900, 2500, 2500, [],
[], [], "Wind", "Shining Emerald Blast! Sha-shing!", lusterDragon2, 1);
var lusterDragon2 = new Dragon("Luster Dragon 2", 2400, 2400, 3100, 3100, [],
[], [], "Wind", "Ultimate Emerald Blast! Shaka-shing!", null, 1);
var wattailDragon = new Dragon("Wattail Dragon", 2500, 2500, 3000, 3000, [],
[], [], "Light", "Shock Bolt! KRAKA-THOOM!", null, 1);
var babyDragon = new Dragon("Baby Dragon", 1200, 1200, 1800, 1800, [], [],
[], "Wind", "Mini Fang! Chomp!", thousandDragon, 1);
var thousandDragon = new Dragon("Thousand Dragon", 2400, 2400, 3500, 3500,
[], [], [], "Wind", "Thousand Fang! Chomp!", null, 1);
var alexandriteDragon = new Dragon("Alexandrite Dragon", 2000, 2000, 2400,
2400, [], [], [], "Light", "Diamond Blast! Sha-shing!", null, 1);
var hyozanryu = new Dragon("Hyozanryu", 2100, 2100, 3800, 3800, [], [], [],
"Light", "Diamond Blade! Shing!", lightEndDragon, 1);
var labradoriteDragon = new Dragon("Labradorite Dragon", 0, 0, 4500, 4500,
[], [], [], "Dark", "...", darkEndDragon, 1);
var darkEndDragon = new Dragon("Dark End Dragon", 2600, 2600, 4000, 4000,
[darkDrain], [], [], "Dark", "Infernal Force! OOOOOOOOOM!", null, 1);
var lightEndDragon = new Dragon("Light End Dragon", 2600, 2600, 4000,
4000[lightBlast], [], [], "Light", "Shining Force! OOOOOOOOM!", null, 1)
var cyberDragon = new Dragon("Cyber Dragon", 2100, 2100, 2700, 2700, [], [],
[], "Light", "Cyber Burst! FWOOOOM!", cyberTwinDragon, 1);
var cyberTwinDragon = new Dragon("Cyber Twin Dragon", 2800, 2800, 3600, 3600,
[], [], [], "Light", "Cyber Burst v2! FWOOOOM!", cyberEndDragon, 2);
var cyberEndDragon = new Dragon("Cyber End Dragon", 4000, 4000, 5000, 5000,
[cyberPierce], [], [], "Light", "Ultimate Cyber Burst! FWOOOOOOOOOOOOOOOOOOOOM!",
null, 1)
var cyberDragonDrei = new Dragon("Cyber Dragon Drei", 1800, 1800, 2600, 2600,
[], [], [], "Light", "Cyber Burst! FWOOM!", cyberDragonNova, 1);
var cyberDragonNova = new Dragon("Cyber Dragon Nova", 2100, 2100, 3000, 3000,
[cyberUpgrade], [], [], "Light", "Helios Cyber Burst! FWOOOM!",
cyberDragonInfinity, 1);
var cyberDragonInfinity = new Dragon("Cyber Dragon Infinity", 2100, 2100,
3000, 3000, [cyberAbsorb], [cyberGain], [cyberCancel], "Light",
"Infinite Cyber Burst! FWOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOM!",
null, 1);
var evolveAsk = function(){
var selectedDragon = prompt("Which dragon do you want to evolve?");
var dragonToEvolve = selectedDragons[selectedDragon-1];
console.log(dragonToEvolve.name + " selected.");
dragons.shift(dragonToEvolve);
console.log(dragonToEvolve);
dragons.push(dragonToEvolve.evolvesInto);
};
var evolvePrint = function(){
console.log(selectedDragons);
var i = 0;
for (i = 0; i < dragons.length; i++) {
if(dragons[i].evolvesInto !== null){
console.log("Press " + (i+1) + " to select " + dragons[i].name);
selectedDragons.push(dragons[i]);
}
}
};
var selectedDragons = [];
var evolve = function(){
selectedDragons = [];
evolvePrint();
setTimeout(function(){
evolveAsk();
},1000);
}
我是菜鸟,所以可能有一些明显的东西我错过了。任何帮助是极大的赞赏!
PS如果要测试它,请输入以下命令:
dragons.push(lusterDragon);
evolve();
然后按 1 并输入。
解决方案
有一些事情让你的evolvesInto
财产感到困惑。因为lusterDragon
它是一个数组,对于其他龙来说它是一个变量。
我们需要使这一点保持一致。将所有变量转换为字符串的最简单解决方案:
var lusterDragon = new Dragon("Luster Dragon", 1900, 1900, 2500, 2500, [], [], [], "Wind", "Shining Emerald Blast! Sha-shing!", 'lusterDragon2', 1);
如果您想将其保留为嵌套对象(我认为您想要),您需要先定义lusterDragon2
,例如 Fiddle:https ://jsbin.com/nevaqicaro/1/edit
就像现在一样,它将是未定义的,因为lusterDragon2
尚未定义变量。
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