const str = undefined
const restr = str?.name ?? "Unknown";
console.log(restr); // "Unknown"
js的可选链
阅读 197
2022-10-16
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js的可选链
阅读 197
2022-10-16
const str = undefined
const restr = str?.name ?? "Unknown";
console.log(restr); // "Unknown"
相关推荐
精彩评论（0）