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<!DOCTYPE html> <html> <head> <style> body { background-color: yellow; color: red; font-size: 15px; } </style> </head> <body> <p>单击该按钮可显示该文档的样式属性。</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> function myFunction() { var x = document.getElementsByTagName("STYLE")[0]; document.getElementById("demo").innerHTML = x.innerHTML; } </script> </body> </html>