我正在构建一个游戏，我希望从提示中获取玩家的输入，并将其与他们已经使用的输入进行比较，如果他们两次选择相同的内容，则拒绝该选择。这是我的相关代码：
var playerChoiceRow = 0;
var playerChoiceColumn = 0;
var playerAttackArray = [];
function playerAttack(playerChoiceRow,playerChoiceColumn) {
for (var i=0; i<playerAttackArray.length; i++){
if ([playerChoiceRow,playerChoiceColumn] === playerAttackArray[i]){
alert("You have already attacked this space, please choose another.");
playerChoiceRow = prompt("Please choose a number between 0 and 5.");
playerChoiceColumn = prompt("Please choose a number between 0 and 5.");
}
}
if (playerChoiceRow === undefined){
alert("Please choose a number between 0 and 5!");
playerChoiceRow = prompt("Please choose a number between 0 and 5.");
}
if (playerChoiceColumn === undefined){
alert("Please choose a number between 0 and 5!");
playerChoiceColumn = prompt("Please choose a number between 0 and 5.");
}
playerAttackArray.push([playerChoiceRow,playerChoiceColumn]);
while (playerCounter || computerCounter <=4){
var playerChoiceRow = prompt("Please select row of attack. (0 though 5)")-'';
var playerChoiceColumn = prompt("Please select column of attack. (0 though 5)")-'';
playerAttack(playerChoiceRow,playerChoiceColumn);
if (playerCounter == 5){
alert("You have sunk all enemy boats!");
break;
}
}
在Javascript数组中，比较是关于身份，而不是内容；换句话说===，当两个表达式是数组时，两个表达式之间的返回值仅在它们引用同一数组对象时才返回true，而不是在两个包含相同事物的数组中返回。
您可以通过首先将两面都转换为字符串来解决此问题：
if (""+[playerChoiceRow,playerChoiceColumn] === ""+playerAttackArray[i]) ...
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