键盘控制Div的移动

最新推荐文章于 2025-09-10 14:53:18 发布

转载最新推荐文章于 2025-09-10 14:53:18 发布 · 50 阅读

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CC 4.0 BY-SA版权

原文链接：http://www.cnblogs.com/xiaoxiaosha/p/3657986.html

文章标签：

#javascript #ViewUI

<!DOCTYPE HTML>
<html lang="zh-cn">
<head>
<meta charset="utf-8" />
<meta http-equiv="Content-Language" content="zh-cn" />
<title>事件对象-通过键盘控制div运动</title>
<meta name="keywords" content="" />
<meta name="description" content="" />
<style type="text/css">
*{margin: 0px; padding: 0px; font-size:14px; font-family:'微软雅黑';}
.clearfix:after{content:'.';display:block;height:0;clear:both;visibility:hidden}
.clearfix{display:inline-block;}
* html .clearfix{height:1%}
.clearfix{display:black;}
#box{width:100px;height:100px;background:red;position:absolute;}
</style>
</head>
<body>
<div id='box'></div>
</body>
<script type="text/javascript">
window.onload=function(){
  var oDiv =document.getElementById('box');
  document.onkeydown = function(ev){
      var Event = ev||event;
	  var L = oDiv.offsetLeft;
	  var T = oDiv.offsetTop;
	  //alert(Event.keyCode);
	  //←37↑38→39↓40
      if(Event.keyCode==37){
        if(L<=0){
		   L = 0;
		}else{
		  oDiv.style.left = oDiv.offsetLeft-10+'px'; 
		}     
	  }else if(Event.keyCode==38){
	    if(T<=0){
		   L=0; 
		}else{
		  oDiv.style.top = oDiv.offsetTop-10+'px';  
		}
	  }else if(Event.keyCode==39){
	    if(L>=document.documentElement.clientWidth-oDiv.offsetWidth){
		   L=document.documentElement.clientWidth-oDiv.offsetWidth;
		}else{
		  oDiv.style.left = oDiv.offsetLeft+10+'px'; 
		}
	  }else if(Event.keyCode==40){
	    if(T>=document.documentElement.clientHeight-oDiv.offsetHeight){
		   T=document.documentElement.clientHeight-oDiv.offsetHeight;
		}else{
		  oDiv.style.top = oDiv.offsetTop+10+'px';
		}
	  }	  
  }
}
</script>
</html>

鼠标事件:
clientX 是可视区的横坐标
clientY 是可视区的纵坐标
var scrollTop=document.documentElement.scrollTop||document.body.scrollTop;
var scrollLeft = document.documentElement.scrollLeft||document.body.scrollLeft;
document.documentElement.clinetWidth 可视区的宽
document.documentElement.clinetHeight 可视区的高
键盘事件
onkeydown
onkeyup
keyCode-检测鼠标数字
Event = ev||event;
Event.keyCode 用法