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javascript多物体运动实现方法分析

lostyu 人气:0

本文实例讲述了javascript多物体运动实现方法。分享给大家供大家参考,具体如下:

这里需要注意每个运动物体的定时器作为物体的属性独立出来互不影响,属性与运动对象绑定,不能公用

运行效果截图如下:

例子:

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>多物体运动</title>
<style>
div{ width:100px; height:100px; background:red; float:left; margin:10px; border:1px solid black; opacity:0.3; filter:alpha(opacity=30);}
</style>
<script>
window.onload = function()
{
 var aDiv = document.getElementsByTagName('div');
 aDiv[0].onmouseover = function()
 {
  startMove(this, 'width', 300);
 };
 aDiv[0].onmouseout = function()
 {
  startMove(this, 'width', 100);
 };
 aDiv[1].onmouseover = function()
 {
  startMove(this, 'height', 300);
 };
 aDiv[1].onmouseout = function()
 {
  startMove(this, 'height', 100);
 };
 aDiv[2].onmouseover = function()
 {
  startMove(this, 'opacity', 100);
 };
 aDiv[2].onmouseout = function()
 {
  startMove(this, 'opacity', 30);
 };
 aDiv[3].onmouseover = function()
 {
  startMove(this, 'borderWidth', 20);
 };
 aDiv[3].onmouseout = function()
 {
  startMove(this, 'borderWidth', 1);
 };
};
function getStyle(obj, attr)
{
 if(obj.currentStyle){
  return obj.currentStyle[attr];
 }else{
  return getComputedStyle(obj, false)[attr];
 }
}
function startMove(obj, attr, iTarget)
{
 clearInterval(obj.timer);
 obj.timer = setInterval(function(){
  var iCur = 0;
  if(attr == 'opacity'){
   iCur = parseInt(parseFloat(getStyle(obj, attr)) * 100);   
  }else{
   iCur = parseInt(getStyle(obj, attr));
  }
  var iSpeed = (iTarget - iCur) / 8;
  iSpeed = iSpeed > 0 ? Math.ceil(iSpeed) : Math.floor(iSpeed);
  if(iCur == iTarget){
   clearInterval(obj.timer);
  }else{
   if(attr == 'opacity'){
    obj.style.filter = 'alpha(opacity='+ (iCur+iSpeed) +')';
    obj.style.opacity = (iCur+iSpeed)/100;
   }else{
    obj.style[attr] = iCur + iSpeed + 'px';
   }
  }
 }, 30);
}
</script>
</head>
<body>
<div></div>
<div></div>
<div></div>
<div></div>
</body>
</html>

希望本文所述对大家JavaScript程序设计有所帮助。

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