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Tryit: JAVASCRIPT
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<!DOCTYPE html> <html> <body> <h2>正文中的 JavaScript</h2> <p id="demo">一个段落。</p> <button type="button" onclick="myFunction()">试一试</button> <script> function myFunction() { document.getElementById("demo").innerHTML = "段落已更改。"; } </script> </body> </html>