在 JavaScript 中函数为什么被称作一等公民？ | 熊D博客

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https://blog.beard.ink/JavaScript/%E5%9C%A8-JavaScript-%E4%B8%AD%E5%87%BD%E6%95%B0%E4%B8%BA%E4%BB%80%E4%B9%88%E8%A2%AB%E7%A7%B0%E4%BD%9C%E4%B8%80%E7%AD%89%E5%85%AC%E6%B0%91%EF%BC%9F/