未捕获的类型错误: 无法设置未定义的属性“0”

Uncaught TypeError: Cannot set property '0' of undefined

本文关键字：未定义 设置 属性 类型 错误      更新时间：2023-09-26

我正在尝试将值插入数组，但是当我尝试插入值时，它给了我未定义的Connot集属性"0"。但显然我已经定义了数组。

错误行：

this.enemyMinions[i] = new EnemyCombatMinion(new Minion(enemyMinionInfo[0], 0, enemyMinionInfo[1], enemyMinionInfo[2], enemyMinionInfo[3], 0, 0, 0, 0, 0, 0));

这是整个代码：

function Combat() {
  this.enemyMinions = [];
  this.playerMinions = [];
  this.currentEnemyMinion = null;
  this.currentPlayerMinion = null;
}
Combat.prototype.initialize = function() {
  var o = 0;
  for(var i = 0; i < partySlots.length; i++) {
    if(partySlots[i]) {
      this.playerMinions[o] = PlayerCombatMinion(partySlots[i]);
      o++;
    }
  }
  this.currentPlayerMinion = this.playerMinions[0];
   $.ajax({
      url: "./api/generateEnemyCombatMinions.php",
      cache: false
    })
    .done(function( html ) {          
      var response = html.split(":::");
      for(var i = 0; i < response.length; i++) {
        var enemyMinionInfo = response[i].split("::");
        this.enemyMinions[i] = new EnemyCombatMinion(new Minion(enemyMinionInfo[0], 0, enemyMinionInfo[1], enemyMinionInfo[2], enemyMinionInfo[3], 0, 0, 0, 0, 0, 0));
      }
      alert(this.enemyMinions.length);
    });   
}

如您所见，我将 this.enemyMinons 声明为类构造函数中的文字，并尝试在初始化方法中为其定义一个值。

done() 回调不使用您的Combat对象作为this。在 initialize() 函数中保存指向对象的指针，以便以后可以访问该对象。

Combat.prototype.initialize = function() {
  var o = 0;
  for(var i = 0; i < partySlots.length; i++) {
    if(partySlots[i]) {
      this.playerMinions[o] = PlayerCombatMinion(partySlots[i]);
      o++;
    }
  }
  this.currentPlayerMinion = this.playerMinions[0];
  // this is new
  var that= this;
   $.ajax({
      url: "./api/generateEnemyCombatMinions.php",
      cache: false
    })
    .done(function( html ) {          
      var response = html.split(":::");
      for(var i = 0; i < response.length; i++) {
        var enemyMinionInfo = response[i].split("::");
        // use "that" here instead of "this"
        that.enemyMinions[i] = new EnemyCombatMinion(new Minion(enemyMinionInfo[0], 0, enemyMinionInfo[1], enemyMinionInfo[2], enemyMinionInfo[3], 0, 0, 0, 0, 0, 0));
      }
      alert(that.enemyMinions.length);
    });   
}
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