而本任务要做的，正是把这段内联代码 提取到一个外部的 alert.js 文件中 ，让 HTML 页面通过 src 特性引用它。这是教程 「Hello, world!」 中「外部脚本」一节的核心实践，也是真实项目中组织 JavaScript 代码的基本方式。

现代 JavaScript 教程（The Modern JavaScript Tutorial），以最新的 ECMAScript 规范为基准，通过简单但足够详细的内容，为你讲解从基础到高阶的 JavaScript 相关知识。 本文以现代 JavaScript 教程（zh.javascript.info）"条件分支：if 和 '?'"章节中的「显示符号」练习为骨架，系统 ...

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