divの動きを制御する
トピック：divの動きを制御するためのキーパッドの矢印キー
しばらく考えて
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<style type="text/css">
#box {
width: 100px;
height: 100px;
background-color: #8A2BE2;
position: absolute;
}
</style>
</head>
<body>
<div id="box">
</div>
<script type="text/javascript">
document.onkeydown = function(event) {
event = event || window.event;
// 37 39
//var box = document.getElementById("box");
var speed = 10;
if(event.ctrlKey){
speed = 30;
}
switch (event.keyCode) {
case 37:
box.style.left = box.offsetLeft - speed + "px";
break;
case 39:
box.style.left = box.offsetLeft + speed + "px";
break;
case 38:
box.style.top = box.offsetTop-speed+"px";
break;
case 40:
box.style.top = box.offsetTop+speed+"px";
break;
}
};
</script>
</body>
</html>