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<title>JavaScript 渐变效果</title>
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<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
onFinish: function(){}//完成时执行
};
Object.extend(this.options, options || {});
},
//触发
Start: function() {
clearTimeout(this._timer);
//取反表示要设置的状态
this.Show = !this.Show;
//为避免透明度为null值，需要先设置一次透明度
if(this.Opacity.run){ this._setOpacity(this.Show ? this.Opacity.start : this.Opacity.end); }
//根据状态设置目标值
if(this.Show){
this.Opacity.target = this.Opacity.end;
this.Top.target = this.Top.end;
this.Left.target = this.Left.end;
this.Height.target = this.Height.end;
this.Width.target = this.Width.end;
} else{
this.Opacity.target = this.Opacity.start;
this.Top.target = this.Top.start;
this.Left.target = this.Left.start;
this.Height.target = this.Height.start;
this.Width.target = this.Width.start;
}
//设置渐变程序
switch (this.Mode.toLowerCase()) {
case "width" :
this._fun = function(){
this.SetWidth() && this.SetHeight();
//由于分了两步，下面的步长变成两倍
this.Step = 2*this.Step;
this.SetOpacity(); this.SetTop(); this.SetLeft();
this.Step = this.Step/2;
}
break;
case "height" :
this._fun = function(){
this.SetHeight() && this.SetWidth();
//由于分了两步，下面的步长变成两倍
this.Step = 2*this.Step;
this.SetOpacity(); this.SetTop(); this.SetLeft();
this.Step = this.Step/2;
}
break;
case "both" :
default :
this._fun = function(){ this.SetHeight(); this.SetWidth(); this.SetOpacity(); this.SetTop(); this.SetLeft();}
}
//获取变换点位置
//由于设置变换点后与top和left变换有冲突只能执行其一
if(this.Height.pos){ this._y = this._obj.offsetTop + this._obj.offsetHeight * this.Height.pos; this.Top.run = false; }
if(this.Width.pos){ this._x = this._obj.offsetLeft + this._obj.offsetWidth * this.Width.pos; this.Left.run = false; }
this.Run();
},
//执行
Run: function() {
clearTimeout(this._timer);
this._finish = true;
//执行渐变
this._fun();
//未完成继续执行
if (this._finish) { this.onFinish(); }
else { var oThis = this; this._timer = setTimeout(function(){ oThis.Run(); }, this.Time); }
},
//设置高度渐变
SetHeight: function() {
var iGet = this.Get(this.Height, this._obj.offsetHeight - this._yBorder());
if(isNaN(iGet)) return true;
this._obj.style.height = iGet + "px";
//如果有变换点设置
if(this.Height.pos){ this._obj.style.top = this._y - this._obj.offsetHeight * this.Height.pos + "px"; }
return false;
},
//设置宽度渐变
SetWidth: function() {
var iGet = this.Get(this.Width, this._obj.offsetWidth - this._xBorder());
if(isNaN(iGet)) return true;
this._obj.style.width = iGet + "px";
if(this.Width.pos){ this._obj.style.left = this._x - this._obj.offsetWidth * this.Width.pos + "px"; }
return false;
},
//设置top渐变
SetTop: function() {
var iGet = this.Get(this.Top, this._obj.offsetTop);
if(isNaN(iGet)) return true;
this._obj.style.top = iGet + "px";
return false;
},
//设置left渐变
SetLeft: function() {
var iGet = this.Get(this.Left, this._obj.offsetLeft);
if(isNaN(iGet)) return true;
this._obj.style.left = iGet + "px";
return false;
},
//设置透明渐变
SetOpacity: function() {
var iGet = this.Get(this.Opacity, this._getOpacity());
if(isNaN(iGet)) return true;
this._setOpacity(iGet);
return false;
},
//获取设置值
Get: function(o, now){
if(o.run){
var iStep = (o.target - now) / this.Step;
if(iStep){
this._finish = false;
if(Math.abs(iStep) < 1){ iStep = iStep > 0 ? 1 : -1; }
return now + iStep;
}
}
}
};
</script>
<style type="text/css">
.Container{height:450px; width:600px;position:relative; background:#FFFFFF;}
.Fade{
position:absolute;
top:10px;
left:50px;
border:5px solid #000099;
width:460px;
height:360px;
background:#FFFFFF url(r_mm14.jpg) left top;
}
</style>
<input id="idBoth" type
