- charset="utf-8">
- type="text/CSS">
- .cls { background-color: black; }
- class="cls">
- type="button" value="开 / 关灯" id="btn">
- type="text/javascript">
- function my$(id) {
- return document.getElementById(id);
- }
- my$("btn").onclick = function() {
- // 获取 body 标签
- document.body.className = document.body.className != "cls" ? "cls": "";
- }
网页开关灯
来源: http://www.bubuko.com/infodetail-3173656.html