从对象

Question

我有一个这样的对象：

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"
            }
        }
    }
}
];

我正在尝试获得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。我该怎么做才能正确输入1920x1080？

Answer 1

使用括号：

＆＃13;

＆＃13;

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']);

＆＃13;

＆＃13;

＆＃13;

Answer 2

试试这个，

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

Answer 3

你应该写下：

obj[0].images.illustration['16x9']['1920x1080']

在JS中，如果你有具有特定同义词的对象键，你应该将它包装在方括号[＆＃39; 1920x1080＆＃39;]中，就像你从数组中得到elemet一样。