本篇技术指南以 Modern JavaScript Tutorial（javascript.info）仓库中 6-calculator-extendable 练习为骨架，完整剖析一个"可扩展计算器"的构造器函数实现：既能解析 "NUMBER operator NUMBER" 形式的字符串表达式，又能通过 addMethod 在运行时动态注册新运算符。读完本文，你将掌握 ...

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