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<!DOCTYPE html> <html> <body> <h2>外部 JavaScript</h2> <p id="demo">一个段落。</p> <button type="button" onclick="myFunction()">试一试</button> <p>（myFunction 存储在名为“myScript.js”的外部文件中）</p> <script src="/js/myScript.js"></script> </body> </html>