<!DOCTYPE HTML> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312"> <title>className属性</title> <style> body{ font-size:16px;} .one{ border:1px solid #eee; width:230px; height:50px; background:#ccc; color:red; } .two{ border:1px solid #ccc; width:230px; height:50px; background:#9CF; color:blue; } .p{ border:; width:; height:; background:; color:; } </style> </head> <body> <p id="p1" > JavaScript使网页显示动态效果并实现与用户交互功能。</p> <input type="button" value="添加样式" onclick="add()"/> <input type="button" value="恢复样式" onclick="back1()"/> <p id="p2" class="one">JavaScript使网页显示动态效果并实现与用户交互功能。</p> <input type="button" value="更改外观" onclick="modify()"/> <input type="button" value="恢复样式" onclick="back2()"/> <script type="text/javascript"> function add(){ var p1 = document.getElementById("p1"); p1.className="one"; } function modify(){ var p2 = document.getElementById("p2"); p2.className="two"; } function back1() { var back=document.getElementById("one"); back.className="p" } function back2() { var back=document.getElementById("two"); back.className="p" } </script> </body> </html>
或许有更好的方法可以恢复样式?
var back=document.getElementById("one");
var back=document.getElementById("two");
你获取ID 为one的元素和ID为two的元素,你根本都没有定义,你怎么改变他的className
赞 能不能一个按钮同时让两个样式都返回
楼主nb
<!DOCTYPE HTML> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312"> <title>className属性</title> <style> body{ font-size:16px;} .one{ border:1px solid #eee; width:230px; height:50px; background:#ccc; color:red; } .two{ border:1px solid #ccc; width:230px; height:50px; background:#9CF; color:blue; } #pp{ border:; width:; height:; background:; color:; } </style> </head> <body> <p id="p1" > JavaScript使网页显示动态效果并实现与用户交互功能。</p> <input type="button" value="添加样式" onclick="add()"/> <input type="button" value="恢复样式" onclick="back1()"/> <p id="p2" class="one">JavaScript使网页显示动态效果并实现与用户交互功能。</p> <input type="button" value="更改外观" onclick="modify()"/> <input type="button" value="恢复样式" onclick="back2()"/> <script type="text/javascript"> function add(){ var p1 = document.getElementById("p1"); p1.className="one"; } function modify(){ var p2 = document.getElementById("p2"); p2.className="two"; } function back1() { var back=document.getElementById("p1"); back.className="pp"; } function back2() { var back=document.getElementById("p2"); back.className="one"; } </script> </body> </html>
已解决