如何写一个通用的JavaScript效果库

/**//****************************************************/
// 移动， 这里是move to 就是移动到 x,y 当然，大家也可以再扩展一个move by 移动x个象素
Effect.Init.move=function(effect){ //初始化
if (effect.options.x!==undefined || effect.options.y!==undefined){
var pos=Position.cumulativeOffset(effect.element);
effect.setting.left =pos[0];
effect.setting.top =pos[1];
effect.setting.position =effect.element.style.position;
effect.element.style.position ="absolute"
effect.options.x=(effect.options.x===undefined)?effect.setting.left:effect.options.x;
effect.options.y=(effect.options.y===undefined)?effect.setting.top :effect.options.y;
}
}
Effect.Fn.move=function(effect,pos){ //效果
if (effect.options.x===undefined && effect.options.y===undefined) return
effect.element.style.left=effect.setting.left + (effect.options.x-effect.setting.left) * pos +"px";
effect.element.style.top =effect.setting.top + (effect.options.y-effect.setting.top ) * pos +"px";
}
/**//****************************************************/
/**//****************************************************/
// zoom by Go_Rush(阿舜) from http://ashun.cnblogs.com/
Effect.Init.zoom=function(effect){
effect.setting.zoom =effect.element.style.zoom || 1;
// firefox 不支持 css的 zoom 用 改变 width,height的方式代替
if (effect.options.zoom!==undefined && navigator.userAgent.toLowerCase().indexOf('firefox') != -1){
effect.options.w=effect.element.offsetWidth * effect.options.zoom;
effect.options.h=effect.element.offsetHeight * effect.options.zoom;
}
}
Effect.Fn.zoom=function(effect,pos){
if (effect.options.zoom===undefined) return;
effect.element.style.zoom=effect.setting.zoom+(effect.options.zoom-effect.setting.zoom)*pos
}
/**//****************************************************/
/**//****************************************************/
// size 同上，是 size to, 改变到指定大小 by Go_Rush(阿舜) from http://ashun.cnblogs.com/
Effect.Init.size=function(effect){
if (effect.options.w!==undefined || effect.options.h!==undefined){
effect.setting.overflow =effect.element.style.overflow || 'visible';
effect.setting.width =effect.element.offsetWidth;
effect.setting.height =effect.element.offsetHeight;
effect.element.style.overflow ="hidden"
effect.options.w=(effect.options.w===undefined)?effect.setting.width :effect.options.w;
effect.options.h=(effect.options.h===undefined)?effect.setting.height:effect.options.h;
}
}
Effect.Fn.size=function(effect,pos){
if (effect.options.w===undefined && effect.options.h===undefined) return;
effect.element.style.width =effect.setting.width + (effect.options.w-effect.setting.width ) * pos +"px";
effect.element.style.height=effect.setting.height+ (effect.options.h-effect.setting.height) * pos +"px";
}
/**//****************************************************/
/**//****************************************************/
// 背景色 by Go_Rush(阿舜) from http://ashun.cnblogs.com/
Effect.Init.bgcolor=function(effect){
if (effect.options.bgcolor!==undefined && /^\#?[a-f0-9]{6}$/i.test(effect.options.bgcolor)){
var color =effect.element.style.backgroundColor || "#ffffff";
//FireFox 下,即使css样式设置背景为 #ffffff格式,但程序取到的是 rgb(255,255,255)格式, 这里把他转化为 #ffffff格式
if (/rgb/i.test(color)){ // "rgb(255, 0, 255)"
//var arr=color.replace(/[rgb\(\s\)]/gi,"").split(",")
var arr=eval(color.replace("rgb","new Array"))
color="#"+Number(arr[0]).toColorPart()+Number(arr[1]).toColorPart()+Number(arr[2]).toColorPart()
}
effect.setting.bgcolor=color
}
}
Effect.Fn.bgcolor=function(effect,pos){
if (effect.options.bgcolor===undefined) return;
var c1=effect.setting.bgcolor,c2=effect.options.bgcolor
var arr1=[parseInt(c1.slice(1,3),16),parseInt(c1.slice(3,5),16),parseInt(c1.slice(5),16)]
var arr2=[parseInt(c2.slice(1,3),16),parseInt(c2.slice(3,5),16),parseInt(c2.slice(5),16)]
var r=Math.round(arr1[0]+(arr2[0]-arr1[0])*pos)
var g=Math.round(arr1[1]+(arr2[1]-arr1[1])*pos)
var b=Math.round(arr1[2]+(arr2[2]-arr1[2])*pos)
effect.element.style.backgroundColor="#"+r.toColorPart()+g.toColorPart()+b.toColorPart()
}
/**//****************************************************/
/**//****************************************************/
// 透明度，这个上个贴过了 by Go_Rush(阿舜) from http://ashun.cnblogs.com/
Effect.Init.opacity=function(effect){
if (effect.options.opacity===undefined) return;
effect.setting.opacity=Opacity(effect.element);
}
Effect.Fn.opacity=function(effect,pos){
if (effect.options.opacity===undefined) return;
Opacity(effect.element,effect.setting.opacity+(effect.options.opacity-effect.setting.opacity)*pos);
}
/**//****************************************************/

这里 effect.setting 是非常有用而且非常重要的冬冬，所有的通过options传进来自定义函数都可以
通过effect.setting来获取element最初的设置。 在很多场合，我们需要在 options 中传一个 onComplete
函数进来， 用来在效果执行完毕后，打扫战场，恢复一些设置。
这些效果是可以重叠的，大家可以看看下面我写的例子。
写了十来个例子，应该很详细了。
完整的，可调试代码和例子如下：
可运行代码:<script language="javascript">
/**//*
这个函数的代码来自 Prototype.js http://prototype.conio.net/
如果页面引用了prototype.js ,则可以删除下面这个函数,
当然,即使不删除也没关系,因为作了简单的兼容性判断
*/
(function(){
if (!("Prototype" in window)){
Prototype={emptyFunction:function(){}};
Class ={
create: function(){return function(){this.initialize.apply(this, arguments)}}
};
$ = function(element){
return typeof(element)=="string"?document.getElementById(element):element
};
$A= function(arrLike){
for(var i=0,ret=[];i<arrLike.length;i++) ret[i]=arrLike[i];
return ret
};

Number.prototype.toColorPart =function(){return String("00"+this.toString(16)).slice(-2)};
Function.prototype.bind = function() {
var __method = this, args = $A(arguments), object = args.shift();
return function(){return __method.apply(object, args.concat($A(arguments)))}
}

Position={
cumulativeOffset: function(element) {
var valueT = 0, valueL = 0;
do {
valueT += element.offsetTop || 0;
valueL += element.offsetLeft || 0;
element = element.offsetParent;
} while (element);
return [valueL, valueT];
}
}
}
})()

/**//*
1.读取/设置 透明度,
2.如果只传了一个参数element,则返回 element的透明度 (0<value<1)
3.如果传了两个参数 element和value 则把element的透明度设置为value value范围 0-1

*/
function Opacity(element,value){
//by Go_Rush(阿舜) from http://ashun.cnblogs.com/
var ret;
if (value===undefined){ //读取
if (!/msie/i.test(navigator.userAgent))
if (ret=element.style.opacity) return parseFloat(ret);
try{return element.filters.item('alpha').opacity/100}catch(x){return 1.0}
}else{ //设置
value=Math.min(Math.max(value,0.00001),0.999999) //这句修复一些非ie浏览器opacity不能设置为1的bug
if (/msie/i.test(navigator.userAgent)) return element.style.filter="alpha(opacity="+value*100+")"
return element.style.opacity=value
}
}

Effect =Class.create();
Effect.Fn =new Object();
Effect.Init =new Object();

Effect.prototype={
//by Go_Rush(阿舜) from http://ashun.cnblogs.com/

initialize: function(element,options) {
this.element = $(element);
this.options = options || {};
this.duration = (this.options.duration || 2) * 1000; //效果执行时间
this.fps = this.options.fps || 50; //频率
this.steps = Math.floor(this.duration/this.fps); //当前步长，注： 这个变量是递减的，当它0的时候意味着整个效果结束
this.maxSteps = this.steps; //整个效果的步长
this.setting = new Object();
this.timer = null;

if (this.options.delay){ // 延时处理
var _this=this;
setTimeout(function(){
_this.setup(_this);
(_this.options.onStart || Prototype.emptyFunction)(_this);
_this.run();
}, _this.options.delay*1000);
}else{
this.setup(this);
(this.options.onStart || Prototype.emptyFunction)(this);
this.run();
}
},
run: function() {
if (this.isFinished()) return (this.options.onComplete || Prototype.emptyFunction)(this);
if (this.timer) clearTimeout(this.timer);
this.duration -= this.fps;
this.steps--;
var pos=1-this.steps/this.maxSteps ; //总进度的百分比
this.loop(this,pos);
(this.options.onUpdate || Prototype.emptyFunction)(this,pos);
this.timer = setTimeout(this.run.bind(this), this.fps);
},
isFinished: function() {
return this.steps <= 0;
},
setup:function(effect){ //初始化设置所有效果单元
for(var key in Effect.Init){
if (typeof(Effect.Init[key])!="function") continue;
try{Effect.Init[key](this)}catch(x){}
}
},
loop:function(effect,pos){ //执行所有效果单元
for(var key in Effect.Fn){
if (typeof(Effect.Fn[key])!="function") continue;
try{Effect.Fn[key](effect,pos)}catch(x){}
}
}
}

/**//****************************************************/

// 移动， 这里是move to 就是移动到 x,y 当然，大家也可以再扩展一个move by 移动x个象素
Effect.Init.move=function(effect){ //初始化
if (effect.options.x!==undefined || effect.options.y!==undefined){
var pos=Position.cumulativeOffset(effect.element);
effect.setting.left =pos[0];
effect.setting.top =pos[1];
effect.setting.position =effect.element.style.position;
effect.element.style.position ="absolute"
effect.options.x=(effect.options.x===undefined)?effect.setting.left:effect.options.x;
effect.options.y=(effect.options.y===undefined)?effect.setting.top :effect.options.y;
}
}

Effect.Fn.move=function(effect,pos){ //效果
if (effect.options.x===undefined && effect.options.y===undefined) return
effect.element.style.top =effect.setting.top + (effect.options.y-effect.setting.top ) * pos +"px";
effect.element.style.left=effect.setting.left + (effect.options.x-effect.setting.left) * pos +"px";

}
/**//****************************************************/

/**//****************************************************/
// zoom
Effect.Init.zoom=function(effect){
effect.setting.zoom =effect.element.style.zoom || 1;
// firefox 不支持 css的 zoom 用 改变 width,height的方式代替
if (effect.options.zoom!==undefined && navigator.userAgent.toLowerCase().indexOf('firefox') != -1){
effect.options.w=effect.element.offsetWidth * effect.options.zoom;
effect.options.h=effect.element.offsetHeight * effect.options.zoom;
}
}
Effect.Fn.zoom=function(effect,pos){
if (effect.options.zoom===undefined) return;
effect.element.style.zoom=effect.setting.zoom+(effect.options.zoom-effect.setting.zoom)*pos
}

/**//****************************************************/

/**//****************************************************/
// size 同上，是 size to, 改变到指定大小
Effect.Init.size=function(effect){
if (effect.options.w!==undefined || effect.options.h!==undefined){
effect.setting.overflow =effect.element.style.overflow || 'visible';
effect.setting.width =effect.element.offsetWidth;
effect.setting.height =effect.element.offsetHeight;
effect.element.style.overflow ="hidden"
effect.options.w=(effect.options.w===undefined)?effect.setting.width :effect.options.w;
effect.options.h=(effect.options.h===undefined)?effect.setting.height:effect.options.h;
}
}

Effect.Fn.size=function(effect,pos){
if (effect.options.w===undefined && effect.options.h===undefined) return;
effect.element.style.width =effect.setting.width + (effect.options.w-effect.setting.width ) * pos +"px";
effect.element.style.height=effect.setting.height+ (effect.options.h-effect.setting.height) * pos +"px";
}
/**//****************************************************/

/**//****************************************************/
// 背景色
Effect.Init.bgcolor=function(effect){
if (effect.options.bgcolor!==undefined && /^\#?[a-f0-9]{6}$/i.test(effect.options.bgcolor)){
var color =effect.element.style.backgroundColor || "#ffffff";
//FireFox 下,即使css样式设置背景为 #ffffff格式,但程序取到的是 rgb(255,255,255)格式, 这里把他转化为 #ffffff格式
if (/rgb/i.test(color)){ // "rgb(255, 0, 255)"
//var arr=color.replace(/[rgb\(\s\)]/gi,"").split(",")
var arr=eval(color.replace("rgb","new Array"))
color="#"+Number(arr[0]).toColorPart()+Number(arr[1]).toColorPart()+Number(arr[2]).toColorPart()
}
effect.setting.bgcolor=color
}
}
Effect.Fn.bgcolor=function(effect,pos){
if (effect.options.bgcolor===undefined) return;
var c1=effect.setting.bgcolor,c2=effect.options.bgcolor
var arr1=[parseInt(c1.slice(1,3),16),parseInt(c1.slice(3,5),16),parseInt(c1.slice(5),16)]
var arr2=[parseInt(c2.slice(1,3),16),parseInt(c2.slice(3,5),16),parseInt(c2.slice(5),16)]
var r=Math.round(arr1[0]+(arr2[0]-arr1[0])*pos)
var g=Math.round(arr1[1]+(arr2[1]-arr1[1])*pos)
var b=Math.round(arr1[2]+(arr2[2]-arr1[2])*pos)
effect.element.style.backgroundColor="#"+r.toColorPart()+g.toColorPart()+b.toColorPart()
}
/**//****************************************************/

/**//****************************************************/
// 透明度，这个上个贴过了
Effect.Init.opacity=function(effect){
if (effect.options.opacity===undefined) return;
effect.setting.opacity=Opacity(effect.element);
}

Effect.Fn.opacity=function(effect,pos){
if (effect.options.opacity===undefined) return;
Opacity(effect.element,effect.setting.opacity+(effect.options.opacity-effect.setting.opacity)*pos);
}
/**//****************************************************/

function foo1(){
new Effect("div1",{bgcolor:"#3a3e3f"})
}

function foo2(){
new Effect("div1",{w:150,h:100})
}

function foo3(){
new Effect("div1",{x:100,y:100})
}

function foo4(){
new Effect("div1",{opacity:0.2})
}

function foo5(){
new Effect("div1",{zoom:2})
}

function foo6(){
new Effect("div1",{w:222,h:111,onComplete:function(){
new Effect("div1",{x:100,y:300,onComplete:function(){
new Effect("div1",{opacity:0.7,onComplete:function(){
new Effect("div1",{zoom:2,onComplete:function(){
new Effect("div1",{bgcolor:"#111111",onComplete:function(){
alert("all done")
}})
}})
}})
}})
}})
}

function fix1(){
new Effect("div1",{zoom:4,opacity:0,x:0,y:0,onComplete:function(eff){
eff.element.style.display="none"
}})
}

function fix2(){
new Effect("div1",{y:80,h:22})
}

function fix3(){ //注意这种复合
new Effect("div1",{h:22,onComplete:function(eff){
new Effect("div1",{w:0})
}})
new Effect("div1",{opacity:0,duration:4})

}

function fix4(){
new Effect("div1",{opacity:0,zoom:0})
}

function fix5(){
new Effect("div1",{bgcolor:"#000000",onComplete:function(){
new Effect("div1",{bgcolor:"#ffffff"})
}})
}

var i=0;
function fix6(){
if (++i>5) return false;
new Effect("div1",{x:280,delay:0.5,duration:0.1,onComplete:function(){
new Effect("div1",{x:320,duration:0.1,onComplete:function(){
new Effect("div1",{x:280,duration:0.1,onComplete:function(){
new Effect("div1",{x:320,duration:0.1,onComplete:function(){
new Effect("div1",{x:280,duration:0.1,onComplete:function(){
new Effect("div1",{x:300,duration:0.1,onComplete:function(){
fix6()
}})
}})
}})
}})
}})
}})
}

</script>
<fieldset>
<legend>单一效果</legend>
<button onclick="javascript:foo1()">颜 色 foo1</button>
<button onclick="javascript:foo2()">大 小 foo2</button>
<button onclick="javascript:foo3()">位 置 foo3</button>
<button onclick="javascript:foo4()">透 明 度 foo4</button>
<button onclick="javascript:foo5()">Zoom foo5</button>
<button onclick="javascript:foo6()">所有 foo6</button>

</fieldset>

<fieldset>
<legend>复合效果</legend>
<button onclick="javascript:fix1()"> 淡出fix1</button>
<button onclick="javascript:fix2()"> 折起fix2</button>
<button onclick="javascript:fix3()"> 慢慢变小消失 fix3</button>
<button onclick="javascript:fix4()"> 慢慢变小消失2 fix4</button>
<button onclick="javascript:fix5()"> 变色 fix5</button>
<button onclick="javascript:fix6()"> 震动5次 fix6</button>

</fieldset>

<button onclick="javascript:location.reload()"> 每次效果后按这里恢复</button>

注意 FireFox 不支持 Zoom

<div id="div1" style="border:1px solid red;width:300px;height:150px;overflow:hidden;position:absolute;left:300px;top:200px;z-index:2;background-color:#ffffff">
<a href="Go_Rush'>http://ashun.cnblogs.com/">Go_Rush(阿舜)</a>
<img src="http://www.google.com/intl/zh-CN_ALL/images/logo.gif">

</div>

[Ctrl+A 全选 提示:你可先修改部分代码,再按运行]

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