javascript - 从对象中提取图像值

Question

这个问题已经有答案了:

JavaScript object: access variable property by name as string [duplicate] (3 个回答)

已关闭 6 年前。

我有一个像这样的对象:

var obj = [
{
    "id": 728,
    "title": "A long day",
    "images": {
        "illustration": {
            "title": "Preview",
            "16x9": {
                "1248x702": "https://example.com/image/225944d77559.jpg",
                "1920x1080": "https://example.com/image/4546b05422594.jpg"
            }
        }
    }
}
];

我正在尝试一段时间来获取 1920x1080值，但没有成功:

            alert(obj[0].title); //works 
            alert(obj[0].images.illustration.title); // works 
            alert(obj[0].images.illustration.16x9.1920x1080); // doesn't work and break the code
            alert(obj[0].images.illustration.'16x9'.'1920x1080'); // doesn't work and break the code

我需要你的帮助。我应该怎样做才能正确获取 1920x1080 条目？

Answer 1

使用括号:

var obj = [
{
    "id": 728,
    "title": "A long day",
    "images": {
        "illustration": {
            "title": "Preview",
            "16x9": {
                "1248x702": "https://example.com/image/225944d77559.jpg",
                "1920x1080": "https://example.com/image/4546b05422594.jpg"
            }
        }
    }
}
];

console.log(obj[0].images.illustration['16x9']['1920x1080']);