const age = null;
const a = age ?? 123;
console.log(a); //123
const age = undefined
const a = age ?? 123
console.log(a); //123
const age = 0
const a = age ?? 123
console.log(a); //0
空值运算符 ?? 判断undefined和null
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转载自blog.csdn.net/qiaoqiaohong/article/details/120019514
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