如何调用在 javascript 的数组中创建的对象的函数?

How do you call functions of objects which were created within an array in javascript?

在下面的代码中,TypeError "database[(0 , 0)].returnVal is not a function" 被吐回:

let database = [
    [
        new DatabaseItem("00", [1, 2, 3, 4], "abcd", ["haiku", "test"]),
        new DatabaseItem("01", [], "", [0, 0, 0, 0, 0, 0])
    ],
    [],
    [],
    [],
    [],
    [],
    [],
    [],
    [],
    []
];
console.log("01 ID: " + database[0,0].returnVal());

但下面的代码没问题:

validityTest = new DatabaseItem("00", [1, 2, 3, 4], "abcd", ["haiku", "test"]);
console.log("test ID: " + validityTest.returnVal());

除了在数组外声明我的所有变量(这将使数组的用途最小化)之外,有没有办法纠正这个问题。我需要能够调用数组中对象的函数。

database[0,0]

这不是访问 javascript 中的多维数组的正确语法。此代码使用令人困惑的 comma operator,意思是:"evaluate the left 0 and ignore it, then evaluate the right 0 and use it as the index of database"。换句话说,它最终与 database[0].

没有什么不同

改为:

database[0][0]