JS实现元素上下左右移动效果

来源：意榕旅游网

本文实例为大家分享了JS实现元素上下左右移动的具体代码，供大家参考，具体内容如下

<!DOCTYPE html> 
<html lang="en"> 
<head> 
 <meta charset="UTF-8"> 
 <title>Document</title> 
 <style> 
 a { 
 cursor: pointer; 
 } 
 #cell { 
 width: 30px; 
 height: 30px; 
 background: red; 
 position: relative; 
 left: 0; 
 top: 0; 
 } 
 </style> 
</head> 
<body onload="move()"> 
 <p>友情提示：请按键盘上的上下左右键</p> 
 <div id="cell"></div> 
 <script> 
 
 function move() { 
 var a = document.getElementById("cell"); 
 a.style.left = 0; 
 a.style.top = 0; 
 document.onkeydown = function(e) { 
 var e = window.event ? window.event : e; 
 if(e.keyCode == 38) { //up 
 a.style.top = parseInt(a.style.top) - 50 + 'px'; 
 //注意要用parseInt 因为a.style.top类型是字符串 
 } 
 if(e.keyCode == 40) { //down 
 a.style.top = parseInt(a.style.top) + 50 + 'px'; 
 } 
 if(e.keyCode == 37) { //left 
 a.style.left = parseInt(a.style.left) - 50 + 'px'; 
 } 
 if(e.keyCode == 39) { //right 
 a.style.left = parseInt(a.style.left) + 50 + 'px'; 
 } 
 } 
 } 
 </script> 
</body> 
</html>

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