给你一段js参考下 <script> function o(id){ return document.getElementById(id); } function divMove(){ var divinfo=o("d1"); var divtop=divinfo.style.top; divinfo.style.top=parseInt(divtop)+50+"px"; } document.onkeyup=function(){ if(event.keyCode==40){ divMove(); } }
function o(id){
return document.getElementById(id);
}
function divMove(){
var divinfo=o("d1");
var divtop=divinfo.style.top;
divinfo.style.top=parseInt(divtop)+50+"px";
} document.onkeyup=function(){
if(event.keyCode==40){
divMove();
}
}
</script></head><body>
<div id="d1" style="background-color:#CCCCFF; width:100px; height:100px; position:absolute; top:50px;"></div>
</body>