<html><head><script src="https://libs.baidu.com/jquery/2.1.4/jquery.min.js"></script><script>$(document).ready(function(){ $("button").click(function(){ $("div").height(function(n,c){ return c+200; }); });});</script></head><body><button>Increase height of div with 200 px</button><br><br><div style="height:100px;border:4px solid;"></div></body></html>