JavaScript twenn动画效果
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本文目录结构
代码-多方向效果
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title>tween动画的基础支持</title>
<style>
#div1{
width: 100px;
height: 100px;
line-height: 100px;
text-align: center;
font-weight: bold;
background: orange;
position: absolute;
top: 0px;
left: 0px;
box-shadow: 5px 5px 10px blue;
border-radius: 10px;
border: 2px solid #ff0000;
opacity: 0.9;
filter:alpha(opacity=90);
}
</style>
</head>
<body>
<div id="div1">朱安邦</div>
</body>
</html>
<script>
var oDiv=document.getElementById("div1");
var jsonStr={
"left":500
};
oDiv.onclick = function(){
if(!this.timer){
starMove(this,jsonStr,1500,4,toGreen);
//starMove(this,jsonStr,1500,["fantan","starInOut"],toGreen);//可以制定运动类型;
}
};
function starMove(ele,jsonStr,duration,moveTypeNum,fnCallback){
//多态:方法重载:JS如何实现方法重载。一个方法,可以有不同类型或个数的参数
//方法重写:子类上的方法覆盖了父类上的方法
var typeNum=moveType.jiansu4.starOut;
if(typeof moveTypeNum =="number"){
if(moveTypeNum===4){
typeNum=moveType.jiansu4.starOut;
}else if(moveTypeNum ===6){
typeNum=moveType.jiansu4.starOut;
}else if(moveTypeNum ===7 ){
typeNum=moveType.jiansu7.starOut;
}else if(moveTypeNum===8){
typeNum=moveType.dabai.starOut;
}else if(moveTypeNum===9){
typeNum=moveType.xiaobai.starOut;
}else if(moveTypeNum===10){
typeNum=moveType.fantan.starOut;
}
}else if(typeof moveTypeNum=="object"){
if(moveTypeNum instanceof Array){
/*输入模式是["fantan","starInOut"]*/
if(moveTypeNum.length==1){
typeNum=moveType[moveTypeNum[0]];//moveTypeNum[0]是获取line方法
}else if(moveTypeNum.length==2){
typeNum=moveType[moveTypeNum[0]][moveTypeNum[1]]//moveType.jiansu1.starIn/out/inOut;
}
}
}else if(typeof moveTypeNum=="function"){
fnCallback=moveTypeNum;
}
var oBegin={};//不同方向的起始值;
var oChange={};//不同方向的运动距离;
var booleanNum=0;
for(var attr in jsonStr){
var begin=setCss(ele,attr);
var target=jsonStr[attr];
var change=target-begin;
if(change){
oBegin[attr]=begin;
oChange[attr]=change;
booleanNum++;
}
}
if(booleanNum===0){
if(typeof fnCallback=="function"){
fnCallback.call(ele);
}
return;
}else{
var interval=13;
var times=0;
clearInterval(ele.timer);
ele.timer=window.setInterval(move,interval);
function move(){
times+=interval;
if(times>=duration){
clearInterval(ele.timer);
ele.timer=null;
for(var attr in jsonStr){
setCss(ele,attr,jsonStr[attr]);
}
if(typeof fnCallback=="function"){
fnCallback.call(ele);
}
}else{
for(var attr in oChange){
//动画效果在这里
var targetNumber=typeNum(times,oBegin[attr],oChange[attr],duration);
setCss(ele,attr,targetNumber);
}
}
}
}
};
//回调方法;
function toGreen(){
setCss(this,"backgroundColor","green");
};
/*setCss*/
function setCss(curEle,attr,value) {//设置CSS属性值和获取CSS;如果三个参数就是设置,2个参数就是获取;att是attribute的缩写;
if(typeof value==="undefined"){//如果有第三个参数,就是设置Css;如果没有就是获取Css;
var reg = /^(?:margin|padding|border|float|position|display|background|backgroundColor)$/;
var flag="getElementsByClassName" in document;
var value = flag ? window.getComputedStyle(curEle, null)[attr] : curEle.currentStyle[attr];
return !reg.test(attr) ? parseFloat(value) : value;
} else{
switch (attr) {
case "opacity":
curEle["style"][attr] = value;
curEle["style"]["filter"] = "alpha(opacity=" + (value * 100) + ")";
break;
case "float":
curEle["style"].cssFloat = value;
curEle["style"].styleFloat = value;
break;
case "backgroundColor":
curEle["style"][attr] = value;
break;
case "zIndex":
curEle["style"][attr] = value;
break;
default:
curEle["style"][attr] = !isNaN(value) ? value += "px" : value;
}
}
};
/*数学计算*/
var moveType = {
/*直线运动*///当前时间*变化量/持续时间+初始值
line: function(t,b,c,d){ return c*t/d + b; },
/*减速中最长用的是4、6、7*/
jiansu1: {//二次方的缓动(t^2);
starIn: function(t,b,c,d){
return c*(t/=d)*t + b;
},
starOut: function(t,b,c,d){
return -c *(t/=d)*(t-2) + b;
},
starInOut: function(t,b,c,d){
if ((t/=d/2) < 1) return c/2*t*t + b;
return -c/2 * ((--t)*(t-2) - 1) + b;
}
},
jiansu2: {//三次方的缓动(t^3)
starIn: function(t,b,c,d){
return c*(t/=d)*t*t + b;
},
starOut: function(t,b,c,d){
return c*((t=t/d-1)*t*t + 1) + b;
},
starInOut: function(t,b,c,d){
if ((t/=d/2) < 1) return c/2*t*t*t + b;
return c/2*((t-=2)*t*t + 2) + b;
}
},
jiansu3: {//四次方的缓动(t^4);
starIn: function(t,b,c,d){
return c*(t/=d)*t*t*t + b;
},
starOut: function(t,b,c,d){
return -c * ((t=t/d-1)*t*t*t - 1) + b;
},
starInOut: function(t,b,c,d){
if ((t/=d/2) < 1) return c/2*t*t*t*t + b;
return -c/2 * ((t-=2)*t*t*t - 2) + b;
}
},
jiansu4: {//5次方的缓动(t^5);
starIn: function(t,b,c,d){
return c*(t/=d)*t*t*t*t + b;
},
starOut: function(t,b,c,d){
return c*((t=t/d-1)*t*t*t*t + 1) + b;
},
starInOut: function(t,b,c,d){
if ((t/=d/2) < 1) return c/2*t*t*t*t*t + b;
return c/2*((t-=2)*t*t*t*t + 2) + b;
}
},
jiansu5: {//正弦曲线的缓动(sin(t))
starIn: function(t,b,c,d){
return -c * Math.cos(t/d * (Math.PI/2)) + c + b;
},
starOut: function(t,b,c,d){
return c * Math.sin(t/d * (Math.PI/2)) + b;
},
starInOut: function(t,b,c,d){
return -c/2 * (Math.cos(Math.PI*t/d) - 1) + b;
}
},
jiansu6: {//指数曲线的缓动(2^t);
starIn: function(t,b,c,d){
return (t==0) ? b : c * Math.pow(2, 10 * (t/d - 1)) + b;
},
starOut: function(t,b,c,d){
return (t==d) ? b+c : c * (-Math.pow(2, -10 * t/d) + 1) + b;
},
starInOut: function(t,b,c,d){
if (t==0) return b;
if (t==d) return b+c;
if ((t/=d/2) < 1) return c/2 * Math.pow(2, 10 * (t - 1)) + b;
return c/2 * (-Math.pow(2, -10 * --t) + 2) + b;
}
},
jiansu7: {//圆形曲线的缓动(sqrt(1-t^2));
starIn: function(t,b,c,d){
return -c * (Math.sqrt(1 - (t/=d)*t) - 1) + b;
},
starOut: function(t,b,c,d){
return c * Math.sqrt(1 - (t=t/d-1)*t) + b;
},
starInOut: function(t,b,c,d){
if ((t/=d/2) < 1) return -c/2 * (Math.sqrt(1 - t*t) - 1) + b;
return c/2 * (Math.sqrt(1 - (t-=2)*t) + 1) + b;
}
},
/*大摆动的效果,非常绚丽;比xiaobai好*/
dabai: {//指数衰减的正弦曲线缓动;
starIn: function(t,b,c,d,a,p){
if (t==0) return b; if ((t/=d)==1) return b+c; if (!p) p=d*.3;
if (!a || a < Math.abs(c)) { a=c; var s=p/4; }
else var s = p/(2*Math.PI) * Math.asin (c/a);
return -(a*Math.pow(2,10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )) + b;
},
starOut: function(t,b,c,d,a,p){
if (t==0) return b; if ((t/=d)==1) return b+c; if (!p) p=d*.3;
if (!a || a < Math.abs(c)) { a=c; var s=p/4; }
else var s = p/(2*Math.PI) * Math.asin (c/a);
return (a*Math.pow(2,-10*t) * Math.sin( (t*d-s)*(2*Math.PI)/p ) + c + b);
},
starInOut: function(t,b,c,d,a,p){
if (t==0) return b; if ((t/=d/2)==2) return b+c; if (!p) p=d*(.3*1.5);
if (!a || a < Math.abs(c)) { a=c; var s=p/4; }
else var s = p/(2*Math.PI) * Math.asin (c/a);
if (t < 1) return -.5*(a*Math.pow(2,10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )) + b;
return a*Math.pow(2,-10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )*.5 + c + b;
}
},
xiaobai: {//超过范围的三次方缓动((s+1)*t^3 - s*t^2);
starIn: function(t,b,c,d,s){
if (s == undefined) s = 1.70158;
return c*(t/=d)*t*((s+1)*t - s) + b;
},
starOut: function(t,b,c,d,s){
if (s == undefined) s = 1.70158;
return c*((t=t/d-1)*t*((s+1)*t + s) + 1) + b;
},
starInOut: function(t,b,c,d,s){
if (s == undefined) s = 1.70158;
if ((t/=d/2) < 1) return c/2*(t*t*(((s*=(1.525))+1)*t - s)) + b;
return c/2*((t-=2)*t*(((s*=(1.525))+1)*t + s) + 2) + b;
}
},
fantan: {//指数衰减的反弹缓动。
starIn: function(t,b,c,d){
return c - moveType.fantan.starOut(d-t, 0, c, d) + b;
},
starOut: function(t,b,c,d){
if ((t/=d) < (1/2.75)) {
return c*(7.5625*t*t) + b;
} else if (t < (2/2.75)) {
return c*(7.5625*(t-=(1.5/2.75))*t + .75) + b;
} else if (t < (2.5/2.75)) {
return c*(7.5625*(t-=(2.25/2.75))*t + .9375) + b;
} else {
return c*(7.5625*(t-=(2.625/2.75))*t + .984375) + b;
}
},
starInOut: function(t,b,c,d){
if (t < d/2) return moveType.fantan.starIn(t*2, 0, c, d) * .5 + b;
else return moveType.fantan.starOut(t*2-d, 0, c, d) * .5 + c*.5 + b;
}
}
};
</script>