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Tryit: JAVASCRIPT
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<!DOCTYPE html> <html> <head> </head> <body> <p>单击按钮创建一个 STYLE 元素，并将其放置在头部。</p> <button onclick="myFunction()">试一试</button> <p>创建的样式元素包含将更改此文档的字体属性的 css 声明。</p> <script> function myFunction() { var x = document.createElement("STYLE"); var t = document.createTextNode("body {font: 20px verdana;}"); x.appendChild(t); document.head.appendChild(x); } </script> </body> </html>