<html> <head> <title>键盘控制div移动，解决停顿问题</title> <meta charset="utf-8" /> <style type="text/css"> #div1{width:100px;height:100px;background:#ff0000;position:absolute;} </style> <script type="text/javascript"> window.onload = function(){ var oDiv = document.getElementById("div1"); var timer = null; var left = false; var right = false; var top = false; var bottom = false; setInterval(function(){ if(left){ oDiv.style.left = oDiv.offsetLeft-10+"px"; }else if(top){ oDiv.style.top = oDiv.offsetTop-10+"px"; }else if(right){ oDiv.style.left = oDiv.offsetLeft+10+"px"; }else if(bottom){ oDiv.style.top = oDiv.offsetTop+10+"px"; } },50); document.onkeydown = function(ev){ var ev = ev || event; var keyCode = ev.keyCode; switch(keyCode){ case 37: left = true;break; case 38: top = true;break; case 39: right = true;break; case 40: bottom = true;break; } } document.onkeyup = function(ev){ var ev = ev || event; var keyCode = ev.keyCode; switch(keyCode){ case 37: left = false;break; case 38: top = false;break; case 39: right = false;break; case 40: bottom = false;break; } } } </script> </head> <body> <div id="div1"></div> </body> </html>