键盘控制div的移动

2022-08-10 09:00:38

<!DOCTYPE html>
<html>
<head>
  <meta charset="UTF-8">
  <title></title>
  <style type="text/css">
   *{
    margin: 0;
    padding: 0;
   }
   div{
    width: 100px;
    height: 100px;
    border: 1px solid #000;
    position: absolute;
   }

  </style>
</head>
<body>
  <div id="oDiv"></div>
  <script>
//   body有默认的margin 这个默认值是多少
//   8px      IE7以下有不同

   var oDiv = document.getElementById("oDiv");

   document.onkeydown = function(event){
//    console.log(oDiv.offsetTop,oDiv.offsetLeft)
//    oDiv.style.top = "30px"
    if(event.keyCode == 39){
     console.log(oDiv.offsetLeft)
     oDiv.style.left = oDiv.offsetLeft + 1 + "px";
    }else if(event.keyCode == 37){
     oDiv.style.left = oDiv.offsetLeft - 1 + "px";
    }

   }
  </script>
</body>
</html>

键盘控制div的移动

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