图片动画特效功能演示-JS特效-爱易网页

图片动画特效功能演示

日期：2014-05-18　浏览次数：20203 次

程序集合了宽度、高度、透明度、top、left的渐变，可以自定义渐变项目和各个项目的初始值结束值，还能以任意点为中心渐变。
使用该程序能实现很多常见的动画特效，包括大小变换、位置变换、渐显渐隐等等。

以下是HTML网页特效代码，点击运行按钮可查看效果：

以下是程序代码

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>JavaScript 渐变效果</title>
</head>
<body>
<script type="text/javascript">
var isIE = (document.all) ? true : false;
var $ = function (id) {
 return "string" == typeof id ? document.getElementById(id) : id;
};
if(!isIE){
 HTMLElement.prototype.__defineGetter__("currentStyle", function () {
  return this.ownerDocument.defaultView.getComputedStyle(this, null);
 });
}
var Class = {
  create: function() {
 return function() {
   this.initialize.apply(this, arguments);
 }
  }
}
Object.extend = function(destination, source) {
 for (var property in source) {
  destination[property] = source[property];
 }
 return destination;
}
var FadeStruct = function(options){
 this.run = false;//是否渐变
 this.start = 0;//开始值
 this.end = 0;//结束值
 this.target = 0;//目标值
 Object.extend(this, options || {});
}
var Fade = Class.create();
Fade.prototype = {
  initialize: function(obj, options) {
 
 var obj = $(obj);
 obj.style.overflow = "hidden";
 this._obj = obj;
 
 this._timer = null;//定时器
 this._finish = true;//是否执行完成
 this._fun = function(){};//渐变程序
 this._x = this._y = 0;//变换点位置
 
 //设置获取透明度程序
 this._setOpacity = isIE ? function(opacity){ obj.style.filter = "alpha(opacity:" + opacity + ")"; } : function(opacity){ obj.style.opacity = opacity / 100; };
 this._getOpacity = isIE ? function(){ return parseInt(obj.filters["alpha"].opacity); } : function(opacity){ return 100 * parseFloat(obj.currentStyle.opacity); };
 
 //获取边框宽度程序
 this._xBorder = function(){ return (parseInt(obj.currentStyle.borderLeftWidth) + parseInt(obj.currentStyle.borderRightWidth)); }
 this._yBorder = function(){ return (parseInt(obj.currentStyle.borderTopWidth) + parseInt(obj.currentStyle.borderBottomWidth)); }
 
 this.SetOptions(options);
 
 this.Mode = this.options.Mode;
 this.Time = Math.abs(this.options.Time);
 this.onFinish = this.options.onFinish;
 
 //先设置特殊默认值
 this.Opacity = new FadeStruct({ end: 100 });
 this.Top = new FadeStruct({ start: this._obj.offsetTop, end: this._obj.offsetTop });
 this.Left = new FadeStruct({ start: this._obj.offsetLeft, end: this._obj.offsetLeft });
 this.Height = new FadeStruct({ end: this._obj.offsetHeight - this._yBorder() });
 this.Width = new FadeStruct({ end: this._obj.offsetWidth - this._xBorder() });
 
 //再设置用户默认值
 Object.extend(this.Opacity, this.options.Opacity);
 Object.extend(this.Top, this.options.Top);
 Object.extend(this.Left, this.options.Left);
 Object.extend(this.Height, this.options.Height);
 Object.extend(this.Width, this.options.Width);
 
 //变换位置参数
 this.Height.pos = Number(this.options.Height.pos);
 this.Width.pos = Number(this.options.Width.pos);
 
 //设置成默认状态
 this.Show = !this.options.Show;
 this.Step = 1;
 this.Start();
 //重新设置Step
 this.Step = Math.abs(this.options.Step);
  },
  //设置默认属性
  SetOptions: function(options) {
 this.options = {//默认值
  Opacity: {},//透明渐变参数
  Height:  {},//高度渐变参数
  Width:  {},//宽度渐变参数
  Top:  {},//Top渐变参数
  Left:  {},//Left渐变参数
  Step:  10,//变化率
  Time:  10,//变化间隔
  Mode:  "both",//渐变顺序
  Show:  false,//是否默认打开状态
  onFin</div></div>

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