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<!DOCTYPE html> <html> <head> <style> #myDIV { margin: auto; border: 1px solid black; outline: coral solid 5px; width: 300px; height: 300px; } </style> </head> <body> <h1>使用 JavaScript 改变轮廓样式</h1> <p>点击“试一试”按钮改变DIV元素的outline-style属性：</p> <button onclick="myFunction()">试一试</button> <div id="myDIV"> <h1>Hello</h1> </div> <script> function myFunction() { document.getElementById("myDIV").style.outlineStyle = "dashed"; } </script> </body> </html>