div运动

最新推荐文章于 2020-09-03 19:45:33 发布

原创最新推荐文章于 2020-09-03 19:45:33 发布 · 474 阅读

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<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<title>无标题文档</title>
<style>
#div1 {width:200px; height:200px; background:red; position:absolute; top:50px; left:0px;}
</style>
<script>
var timer=null;
var backtimer=null;
function startMove()
{
   var oDiv=document.getElementById('div1');

   clearInterval(timer);
    clearInterval(backtimer);
   timer=setInterval(function (){
      var speed=5;

      if(oDiv.offsetLeft>=300)
      {
         clearInterval(timer);
      }
      else
      {
         oDiv.style.left=oDiv.offsetLeft+speed+'px';
      }
   }, 30);
}

function goback()
{
    var oDiv=document.getElementById('div1');
    clearInterval(timer);
    clearInterval(backtimer);
    backtimer=setInterval(function (){
        var speed=-5;

        if(oDiv.offsetLeft<=0)
        {
            clearInterval(backtimer);
        }
        else
        {
            oDiv.style.left=oDiv.offsetLeft+speed+'px';
        }
    }, 30);
}
</script>
</head>

<body>
<input id="btn1" type="button" value="开始运动" onclick="startMove()" />
<input id="btn2"type="button"value="返回"onclick="goback()"/>
<div id="div1">
</div>
</body>
</html>