如何将对象推入数组，然后调用该数组中的对象部分

Question

我正在使用Javascript进行二十一点游戏，这需要为每张卡制作对象，以便多张牌等于10.我随后拨打一个随机数并将相应的卡推入阵列dealerArr，我的问题是当我想添加这些对象在数组中的值一起，似乎不可能，这是代码。

var dealerArr = [];
var playerArr = [];
var dealerTotal = 0;
var playerTotal = 0;
var two = {
  value: 2
}
var three = {
  value: 3
}
var four = {
  value: 4
}
var five = {
  value: 5
}
var six = {
  value: 6
}
var seven = {
  value: 7
}
var eight = {
  value: 8
}
var nine = {
  value: 9
}
var ten = {
  value: 10
}
var jack = {
  value: 10
}
var queen = {
  value: 10
}
var king = {
  value: 10
}
var ace = {
  value: 11
}


function calcTotal(arr) {
  var sum = 0;
  for (var object of arr) {
    sum += object.value;
  }
  return sum;
}

while (calcTotal(dealerArr) < 17) {
  var randomCard = (Math.floor(Math.random() * 13) + 1)
  if (randomCard = 1) {
    dealerArr.push(two);
  } else if (randomCard = 2) {
    dealerArr.push(three);
  } else if (randomCard = 3) {
    dealerArr.push(four);
  } else if (randomCard = 4) {
    dealerArr.push(five);
  } else if (randomCard = 5) {
    dealerArr.push(six);
  } else if (randomCard = 6) {
    dealerArr.push(seven);
  } else if (randomCard = 7) {
    dealerArr.push(eight);
  } else if (randomCard = 8) {
    dealerArr.push(nine);
  } else if (randomCard = 9) {
    dealerArr.push(ten);
  } else if (randomCard = 10) {
    dealerArr.push(jack);
  } else if (randomCard = 11) {
    dealerArr.push(queen);
  } else if (randomCard = 12) {
    dealerArr.push(king);
  } else if (randomCard = 13) {
    dealerArr.push(ace);
  }
  console.log(dealerTotal)
}

Answer 1

problem是你在=声明中使用==而不是if。

JS（以及更多语言）中的单个等于assignment，而comparision则为double和triple等于。

所以请改用以下格式：

var dealerArr = [];
var playerArr = [];
var dealerTotal = 0;
var playerTotal = 0;
var two = {
  value: 2
}
var three = {
  value: 3
}
var four = {
  value: 4
}
var five = {
  value: 5
}
var six = {
  value: 6
}
var seven = {
  value: 7
}
var eight = {
  value: 8
}
var nine = {
  value: 9
}
var ten = {
  value: 10
}
var jack = {
  value: 10
}
var queen = {
  value: 10
}
var king = {
  value: 10
}
var ace = {
  value: 11
}


function calcTotal(arr) {
  var sum = 0;
  for (var object of arr) {
    sum += object.value;
  }
  return sum;
}

while (calcTotal(dealerArr) < 17) {
  var randomCard = (Math.floor(Math.random() * 13) + 1)
  if (randomCard == 1) {
    dealerArr.push(two);
  } else if (randomCard == 2) {
    dealerArr.push(three);
  } else if (randomCard == 3) {
    dealerArr.push(four);
  } else if (randomCard == 4) {
    dealerArr.push(five);
  } else if (randomCard == 5) {
    dealerArr.push(six);
  } else if (randomCard == 6) {
    dealerArr.push(seven);
  } else if (randomCard == 7) {
    dealerArr.push(eight);
  } else if (randomCard == 8) {
    dealerArr.push(nine);
  } else if (randomCard == 9) {
    dealerArr.push(ten);
  } else if (randomCard == 10) {
    dealerArr.push(jack);
  } else if (randomCard == 11) {
    dealerArr.push(queen);
  } else if (randomCard == 12) {
    dealerArr.push(king);
  } else if (randomCard == 13) {
    dealerArr.push(ace);
  }
  console.log(dealerTotal)
}

Answer 2

Jonas是正确的，在JS中，单个=是一个赋值，而==是一个比较，===是一个严格的比较（值和类型比较）