Question

我试图引用数组中的索引，但gameObjects [1]返回未定义。 gameObjects是一个对象数组。

var gameObjects = [enemy,treasure];


var mysteryBlock = {
name: "Mystery Block",
output:"produces " + gameObjects[1] 

}

var enemy = {
output: "an enemy"
}

var treasure = {

  output: "a treasure"

}

console.log("your mystery cube " + mysteryBlock.output)

以未定义的形式返回。

Answer 1

在使用之前，您应该定义enemy和treasure。它无法正常工作，因为您需要引用对象的output属性：

var enemy = {
  output: "an enemy"
}

var treasure = {
  output: "a treasure"
}

var gameObjects = [enemy,treasure];


var mysteryBlock = {
  name: "Mystery Block",
  output:"produces " + gameObjects[1].output 
}


console.log("your mystery cube " + mysteryBlock.output);

Here it is working

Answer 2

gameObjects变量是一个对象数组，如下所示：

[{
  "output": "an enemy"
},
{
  "output": "a treasure"
}]

使用gameObjects[1]调用它，您将收到一个对象。要获得结果，您必须指定key ，在您的情况下为output。

＆＃13;

var enemy = {
  output: "an enemy"
}

var treasure = {
  output: "a treasure"
}

var gameObjects = [enemy, treasure];

var mysteryBlock = {
  name: "Mystery Block",
  output: "produces " + gameObjects[1].output //mentioned line of code
}

console.log("your mystery cube " + mysteryBlock.output)

＆＃13;

你不能在javascript对象中连接字符串和函数调用吗？

2 个答案: