javaScript簡易運動架構封裝——和派孔明

//javascript簡易運動架構封裝
function move(obj,json,opational){

opational=opational||{};
opational.time=opational.time||300;
opational.fn=opational.fn||null;
opational.type=opational.type||'ease-out';

var start={};
var dis={};
for(var key in json){
start[key]=parseFloat(getStyle(obj,key));
dis[key]=json[key]-start[key];
}

var count=Math.round(opational.time/30);
var n=0;

clearInterval(obj.timer);
obj.timer=setInterval(function(){

n++;

for(var key in json){

//var cur=start[key]+n*dis[key]/count;
switch(opational.type){
case 'linear':
var a=n/count;
var cur=start[key]+dis[key]*a;
break;  
case 'ease-in':
var a=n/count;
var cur=start[key]+dis[key]*a*a*a;
break;  
case 'ease-out':
var a=1-n/count;
var cur=start[key]+dis[key]*(1-a*a*a);
break;  
}


if(key=='opacity'){
obj.style.opacity=cur;
obj.style.filter='alpha(opacity='+cur*100+')';
}else{
obj.style[key]=cur+'px';
}
}

console.log('跑');

if(n==count){
clearInterval(obj.timer);
opational.fn && opational.fn();
}

},30);  
 }


 function getStyle(obj,attr){
return obj.currentStyle?obj.currentStyle[attr]:getComputedStyle(obj,false)[attr];
 }