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完美運(yùn)動(dòng)框架

function?getStyle(elem,attr){
????var?result?=?null;
????result?=?elem.currentStyle?elem.currentStyle[attr]:getComputedStyle(elem,false)[attr];
????if(attr=="opacity"){
????????return?parseInt(parseFloat(result)*100);
????}
????return?parseInt(result);
}

var?timer?=?null;
//多個(gè)屬性同時(shí)變化
function?startMove(elem,json,fn){
????var?isStop?=?true;????????????//所有值都到達(dá)
????clearInterval(elem.timer);
????elem.timer?=?setInterval(function(){
????????//歷遍json屬性
????????for(var?attr?in?json){
????????????//1.取當(dāng)前與速度
????????????var?offset??=?json[attr];
????????????var?curAttr?=?getStyle(elem,attr);
????????????var?speed???=?(offset?-?curAttr)/8;
????????????speed?=?speed?>?0??Math.ceil(speed):Math.floor(speed);
????????????
????????????//2.檢測(cè)停止
????????????if(offset!=curAttr){
????????????????isStop?=?false;
????????????}
????????????if(attr=="opacity"){
????????????????elem.style.filter?=?"alpha(opacity:"+(curAttr+speed)+")";
????????????????elem.style.opacity=?(curAttr+speed)/100;
????????????}else{
????????????????elem.style[attr]?=?curAttr?+?speed?+?"px";
????????????}
????????}
????????//所有值都到達(dá)目標(biāo)值,則停止
????????if(isStop){
????????????clearInterval(elem.timer);
????????????if(fn){?fn();?}
????????}
????},30);
}