JS实现盒子跟着鼠标移动及键盘方向键控制盒子移动效果示例

时间:2020-05-16 s_psycho 人气:0

本文实例讲述了JS实现盒子跟着鼠标移动及键盘方向键控制盒子移动。分享给大家供大家参考，具体如下：

1. 盒子跟着鼠标移动

<!doctype html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport"
     content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
  <style>
  *{
    margin:0;
    padding:0;
  }
    div{
      width: 100px;
      height: 100px;
      background: red;
      position: absolute;
    }
  </style>
</head>
<body>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<script>
  document.onmousemove=function fn(ev) {
    var event=window.event||ev;
    var oDiv=document.getElementsByTagName("div");
    for(x=0;x<oDiv.length;x++){
      oDiv[x].style.transition=(x*0.5)+"s";
      oDiv[x].style.left=event.clientX+"px";
      oDiv[x].style.top=event.clientY+"px";
    }
  }
</script>
</body>
</html>

2. 键盘方向键控制盒子移动

<html>
<head>
  <meta charset="utf-8" />
  <style type="text/css">
    div{
      width:100px;
      height:100px;
      background: red;
      position:absolute;
      left:100px;
      top:100px;
      transition: 0.1s;
    }
  </style>
  <script>
        window.onload = function(){
      var oDiv = document.getElementById("div1");
      var left = false;
      var right = false;
      var top = false;
      var bottom = false;
      document.onkeydown = function(ev){
        var oEvent = ev || event;
        var keyCode = oEvent.keyCode;
        switch(keyCode){
          case 37:
            left=true;
            break;
          case 38:
            top=true;
            break;
          case 39:
            right=true;
            break;
          case 40:
            bottom=true;
            break;
        }
      };
      setInterval(function(){
        if(left){
          oDiv.style.left = oDiv.offsetLeft-10+"px";
        }else if(top){
          oDiv.style.top = oDiv.offsetTop-10+"px";
        }else if(right){
          oDiv.style.left = oDiv.offsetLeft+10+"px";
        }else if(bottom){
          oDiv.style.top = oDiv.offsetTop+10+"px";
        }
      },50);
      document.onkeyup = function(ev){
        var oEvent = ev || event;
        var keyCode = oEvent.keyCode;
        switch(keyCode){
          case 37:
            left=false;
            break;
          case 38:
            top=false;
            break;
          case 39:
            right=false;
            break;
          case 40:
            bottom=false;
            break;
        }
      }
    }
  </script>
</head>
<body>
<div id="div1"></div>
</body>
</html>

感兴趣的朋友可以使用在线HTML/CSS/JavaScript代码运行工具：http://tools.softyun.net/code/HtmlJsRun测试一下运行效果。

希望本文所述对大家JavaScript程序设计有所帮助。

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