javascript定时器的简单应用示例【控制方块移动】

程序员文章站 2023-11-12 22:28:46

本文实例讲述了javascript定时器的简单应用。分享给大家供大家参考，具体如下：

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>www.jb51.net 定时器的应用</title>
  <style>
    #div1 { width: 100px; height: 100px; position: absolute; background-color: red; top: 50px; }
  </style>
</head>
<body>
<input id="obtn1" type="button" value="铵钮">
<div id="div1"></div>
<script>
  var obtn = document.getelementbyid("obtn1");
  var odiv = document.getelementbyid("div1");
  //var timer=null;
  //odiv.timer=null;
  obtn.onclick = function() {
    clearinterval(odiv.timer)
    odiv.timer = setinterval(function() {
      var speed = parseint(getstyle(odiv, "left")) + 9;
      if(speed > 800) {
        speed = 800;
      }
      odiv.style.left = speed + "px"
      if(speed == 800) {
        clearinterval(odiv.timer);
        //alert(speed)
      }
    }, 50)
  }
  function getstyle(obj, attr) {
    return obj.currentstyle ? obj.currentstyle[attr] : getcomputedstyle(obj)[attr]
  }
</script>
</body>
</html>

运行结果：