点击倒三角可以进行展开操作
具体代码：
<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/><meta content="width=device-width, initial-scale=1.0" /> <title>jQuery实现收起展开功能 - 何问起</title><base target="_blank" /> <meta charset="utf-8" /> <style> a{color:darkgreen} .hovertreeContent{width:300px;text-indent:2em;margin:5px auto;height:60px;overflow:hidden;position:relative;border:1px solid silver;} .hewenqiToggle{height:20px;background-color:#f0f0f0;border-top:1px solid silver;position:absolute;bottom:0px;width:100%;} .triangle-down-hovertree { width: 0; height: 0; border-left: 8px solid transparent; border-right: 8px solid transparent; border-top: 16px solid #999;position:absolute;right:0px;left:0px;margin:0px auto; top:2px;cursor:pointer;} .triangle-up-hovertree { width: 0; height: 0; border-left: 8px solid transparent; border-right: 8px solid transparent; border-bottom: 16px solid #999; position:absolute;right:0px;left:0px;margin:0px auto;top:2px; } </style> <script src="https://hovertree.com/ziyuan/jquery/jquery-1.12.1.min.js"></script> </head> <body> <div> <h2>jQuery实现收起展开功能</h2> <a href="#">原文</a> <a href="#">首页</a> <a href="#">特效</a> </div> <div> 受到网店的影响，服装店的生意逐渐有所下降，老板找何问起去谈，大概是准备跟上网购潮流，让何问起准备一下， 要在网上开网店，要为服装店建立网站。 何问起也没说自己经验不足，只说会积极准备。于是抓紧时间查找资料，学习练习。 <div><span></span></div> </div> <script> $(".hewenqiToggle").on("click", function () { if ($(".hewenqiToggle").css('position') == "absolute") { $(".hovertreeContent").height("auto"); $(".hewenqiToggle").css({ "position": "relative" }); $(".hewenqiToggle").find("span").removeClass('triangle-down-hovertree').addClass('triangle-up-hovertree'); } else { $(".hovertreeContent").height("60"); $(".hewenqiToggle").css({ "position": "absolute" }); $(".hewenqiToggle").find("span").removeClass('triangle-up-hovertree').addClass('triangle-down-hovertree'); } }) </script> </body> </html>