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<html lang="en"><head> <meta charset="UTF-8"> <title>键盘控制小球的移动</title> <style type="text/css">div{ /* background: orange;*/ width: 100px; height: 100px; padding: 30px; border-radius: 200px; position: absolute; background-image: url(pic/sc16.png);} </style></head><body> <div id="ball" style="top:50px;left: 50px"></div> <script> var key={ W:87,S:83,A:65,D:68,}function keymove(e){ var ball=document.getElementById('ball');var top=parseInt(ball.style.top);var left=parseInt(ball.style.left);// alert(top+50+'px');switch(e.keyCode){ case key.W:ball.style.top=top-50+'px';break;case key.S:ball.style.top=top+50+'px';break;case key.A:ball.style.left=left-50+'px';break;case key.D:ball.style.left=left+50+'px';break;}}document.οnkeydοwn= keymove; </script></body></html>