<!DOCTYPE html> <html><head><meta charset="utf-8"><title>童心少年</title></head><body><input type="text" onkeydown="keydown(event)"><br/><img id="demo" src="https://pic1.arkoo.com/56D0B40F99F841DF8A2425762AE2565D/picture/o_1i4qop009177v1tgf14db15he1iaj1is.jpg" width=40 height=40><p id="cs"></p><script>var w=40;function updatesize(x){document.getElementById("demo").width=w;document.getElementById("demo").height=w;w=w%600+40*x;}function keydown(event){document.getElementById("cs").innerHTML=event.key;if(event.key=="ArrowUp"){updatesize(1);}else if(event.key=="ArrowDown"){updatesize(-1);}}</script></body> </html>