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雄关漫道真如铁,而今迈步从头越。
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空值合并运算符
在 TypeScript(以及 JavaScript)中,?? 是一种称为空值合并运算符(Nullish Coalescing Operator)的语法。它用于在左操作数为 null 或 undefined 时返回右操作数,否则返回左操作数。这对于处理可能为 null 或 und…
TypeScript
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3 months ago
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