Operator - MDN Web Docs Glossary: Definitions of Web-related terms 编辑
Reserved syntax consisting of punctuation or alphanumeric characters that carries out built-in functionality. For example, in JavaScript the addition operator ("+") adds numbers together and concatenates strings, whereas the "not" operator ("!") negates an expression — for example making a true statement return false.
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- Operator (computer programming) on Wikipedia
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