Question

如果定义了对象，我该如何对其进行解构？

const {url} = image; // only destructure if image is defined.
                    // don't want to nest the destructuring in if image condition

Answer 1

如果说

仅在图像定义
时进行结构化

你的意思是它肯定是声明的，那么你可以这样做：

const {url} = image || {};

运行示例：

＆＃13;

let image;
const {url} = image || {};

console.log('url is',url);

＆＃13;

const image = {url: 'someUrl.com'};
const {url} = image || {};

console.log('url is', url);

＆＃13;

Answer 2

目标必须至少声明：

let image;
const { url } = image ? image : {}; // undefined
console.log(url)

let image = { url: '/some/path' };
const { url } = image ? image : {};
console.log(url)