在手机上点击图1的位置，出现图2的效果。
<html><head><script type="text/javascript" src="/js/jquery.js"></script><script type="text/javascript">$(document).ready(function(){ $("button").click(function(){ $("p").slideToggle(); });});</script></head><body><p style="display:none;">这是一个段落。</p>123231111<br><button>切换</button></body></html>
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