<!DOCTYPE html> <html lang="en"> <head><meta charset="UTF-8"><title>jq之demo</title><!--线上jq库--><script src="https://code.jquery.com/jquery-3.4.1.min.js"></script><script>$(document).ready(function(){$("button").click(function(){/*动画*/$("div").animate({/*高度显示/隐藏切换*/height:'toggle'});});});</script> </head> <body> <button>开始</button> <p>html元素想要移动把position设为relative,fixed或absolute</p> <div style="background: aqua;height: 50px;width: 60px;position: absolute;">收起/滑下切换</div> </html>