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JavaScript 简介
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<!DOCTYPE html> <html> <body> <h1>JavaScript</h1> <h2>The onclick Event</h2> <p id="demo">Click the button to change the layout of this paragraph</p> <button onclick="myFunction()">Click Me!</button> <script> function myFunction() { let x = document.getElementById("demo"); x.style.fontSize = "25px"; x.style.color = "red"; } </script> </body> </html>