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空值合并运算符 （??）是一个逻辑运算符，当左侧的操作数为 null 或者 undefined 时，返回其右侧操作数，否则返回左侧操作数。 空值合并?It is most commonly written as x ?? y, but varies across programming languages. While its behavior differs between implementations, the null coalescing operator generally returns t*Nov 1, 2025 · The null-coalescing operator ?? returns the value of its left-hand operand if it isnt null; otherwise, it evaluates the right-hand operand and returns its result. T-The nullish coalescing operator is written as two question marks ??. As it treats null and undefined similarly, we’ll use a special term here, in this article.-Dec 1, 2024 · Nullish Coalescing Operator，中文翻译为“空值合并运算符”。 它由两个问号（??）组成，用于判断一个变量是否为 null 或 undefinedï¼?JavaScript Demo: Expressions - Nullish coalescing operator x 1 const foo = null ?? default string;#空值凝聚运算符是一个有用的工具，可以在你的代码中提供默认值和处理空值或未定义值。 以下是JavaScript中空值凝聚运算符 (??)的语法-