<html><head><script src="https://ajax.aspnetcdn.com/ajax/jQuery/jquery-3.5.1.min.js"></script><script>$(document).ready(function(){ $("button").click(function(){ $("div").height(function(n,c){ return c+200; }); });});</script></head><body><button>将 div 的高度增加 200 像素</button><br><br><div style="height:100px;border:4px solid;"></div></body></html>