AI 编程工具<html><head><meta charset="utf-8"><title>菜鸟教程(runoob.com)</title><style>#ex1 { color: red;}</style></head><body><h1>setProperty() 方法</h1><p>点击按钮设置一个新的 CSS 属性。</p><button onclick="myFunction()">点我</button><div id="ex1">一些文本。</div><script>function myFunction() { var declaration = document.styleSheets[0].cssRules[0].style; var setprop = declaration.setProperty("background-color", "yellow");}</script></body></html>