51help TIY
码：
<html> <head> <script type="text/javascript" src="../jquery/jquery.js" tppabs="http://www.51help.tk/jquery/jquery.js"></script> <script type="text/javascript"> $(document).ready(function(){ $(".btn1").click(function(){ $("p").toggle(true); }); }); </script> </head> <body> <p>This is a paragraph.</p> <p style="display:none">This is another paragraph.</p> <p>把 switch false</p> <button class="btn1">显示所有 p 元素</button> </body> </html>
查看结果: