用js实现的模拟jquery的animate自定义动画(2.5K)

var jelle = function(id){
var $ = function(id){ return document.getElementById(id); },
elem = $(id),//对象
f = 0, _this = {}, lazy = 10, lazyque = 10,// f动画计数器 lazy动画延迟 lazyque队列延迟
// 算子你可以改变他来让你的动画不一样
tween = function(t, b, c, d){ return - c * (t /= d) * (t - 2) + b},
// adv 用于+= -= *= /=操作
adv = function(val, b){
var va, re= /^([+-\\*\/]=)([-]?[\d.]+)/ ;
if (re.test(val)){
var reg = val.match(re);
reg[2] = parseFloat(reg[2]);
switch ( reg[1] ){
case '+=':
va = reg[2];
break;
case '-=':
va = -reg[2];
break;
case '*=':
va = b*reg[2] - b;
break;
case '/=':
va = b/reg[2] - b;
break;
}
return va;
}
return parseFloat(val) - b;
}
// elem.animate 读取用于当前dom元素上的动画队列
elem.animate = elem.animate || [];
//stop 功能要使用的
jelle[id]= {};
jelle[id]['stop'] = true;
//alert(jelle[id]['stop'])
// 统一队列入口 用于方便设置延迟，与停止
_this.entrance = function(fn, ags, lazytime){
//fn 调用函数 ags 参数 lazytime 延迟时间
setTimeout(function(){
fn(ags[0], ags[1], ags[2]);
}, (lazytime || 0));
}
// 停止动画 此方法还不能用
_this.stop = function(){
jelle[id]['stop'] = false;
elem.animate.length=0;
$(id).animate.length=0;
return _this;
}
// 队列操作
_this.queue = function(){
if (elem.animate && ++f == elem.animate[0].length){
f = 0;// 清空计数器
elem.animate[0].callback ? elem.animate[0].callback.apply(elem) : false;
// 判断是否有动画在等待执行
if (elem.animate.length > 1){
elem.animate[0].callback = elem.animate[1].callback;
elem.animate = $(id).animate || [];// 从dom对象上获取最新动画队列
elem.animate.shift();// 清除刚执行完的动画队列
$(id).animate = elem.animate;// 把新的队列更新到dom
var ea = elem.animate[0];
// 循环播放队列动画
for(var i = 0; i < ea.length; i++){
ea[i][0] === 'opacity' ? _this.entrance(_this.alpha, [ea[i][1], ea[i][2]], lazyque):
_this.entrance(_this.execution, [ea[i][0], ea[i][1], ea[i][2]], lazyque);
}
}else{
elem.animate.length = 0; // 队列清楚
$(id).animate.length = 0; // 队列清楚
}
}
}
//设置lazy方法，以后的队列动画延迟时间
_this.delay = function(val){
lazyque = val;
return _this;
}
//动画变化
_this.execution = function(key, val, t){
//alert(val)
var s = (new Date()).getTime(), d=t || 500 ,
b = parseFloat(elem.style[key]) || 0 ,
c = adv(val, b) ,// adv用于设置高级操作比如 += -= 等等
un = val.match(/\d+(.+)/)[1];// 单位
(function(){
var t = (new Date()).getTime() - s;
if (t > d){
t = d;
elem.style[key] = parseInt(tween(t, b, c, d)) + un;
_this.queue(); // 操作队列
return _this;
}
elem.style[key] = parseInt(tween(t, b, c, d)) + un;
jelle[id]['stop'] && setTimeout(arguments.callee, lazy);
// _this.entrance(arguments.callee,[1,1,1],lazy);
// arguments.callee 匿名函数递归调用
})();
}
// 入口
_this.animate = function(sty, t, fn){
// sty,t,fn 分别为 变化的参数key,val形式,动画用时,回调函数
var len = elem.animate.length;// len查看动画队列长度
elem.animate[len] = [];
elem.animate[len].callback = fn;
//多key 循环设置变化
for(var i in sty){
elem.animate[len].push([i, sty[i], t]);
if(len == 0){
i == 'opacity' ? _this.entrance(_this.alpha, [sty[i], t], lazyque) :
_this.entrance(_this.execution, [i, sty[i], t], lazyque);
}
}
$(id).animate = elem.animate;//把新的动画队列添加到dom元素上
return _this;
}
// 透明度变化的代码
_this.alpha = function(val, t){
var s = (new Date()).getTime(),
d = t || 500, b, c;
if( document.defaultView ){
b = document.defaultView.getComputedStyle(elem,null)['opacity'] || 1,
c = adv(val,b) * 100;
(function(){
var t = (new Date()).getTime() - s;
if(t > d){
t = d;
elem.style['opacity'] = tween(t, (100 * b), c, d) / 100;
_this.queue(); // 队列控制
return _this;
}
elem.style['opacity'] = tween(t, (100 * b), c, d) / 100;
jelle[id]['stop'] && setTimeout(arguments.callee, lazy);
})()
}else{
b = elem.currentStyle['filter'] ?
(elem.currentStyle['filter'].match(/^alpha\(opacity=([\d\.]+)\)$/))[1]/100 : 1;
c = adv(val, b) * 100;
(function(){
var t = (new Date()).getTime() - s;
if (t > d){
t = d;
elem.style['filter']='alpha(opacity='+ tween(t, (100 * b), c, d) +')';
_this.queue(); // 队列控制
return _this;
}
elem.style['filter'] = 'alpha(opacity='+ tween(t, (100*b) , c, d) +')';
jelle[id]['stop'] && setTimeout(arguments.callee, lazy);
})()
}
}
return _this;
}