关于《JS动画效果》课程的疑问，以下代码无法进行链式动画，原因是什么？

Question

function getStyle(obj,attr){ if(obj.currentStyle){ return obj.currentStyle[attr]; }else{ return getComputedStyle(obj,false)[attr]; }}//startMove(obj,{attr1:iTarget,attr2:iTarget},fn);var alpha = 30;function startMove(obj,json,fn){ var flag = true;//假设 clearInterval(obj.timer); obj.timer=setInterval(function(){ for (var attr in json){ //1.取当前值 var icur = 0; if(attr == 'opacity'){ icur = Math.round(parseFloat(getStyle(obj,attr))*100); }else{ icur=parseInt(getStyle(obj,attr)); } //2.算速度 var speed=(json[attr]-icur)/8; speed=speed>0?Math.ceil(speed):Math.floor(speed); //3.检测停止 if(icur!=json[attr]){ flag = false; } if(attr == 'opacity'){ obj.style.filter = 'alpha(opacity:'+(icur + speed)+')' obj.style.opacity = (icur + speed)/100; }else{ obj.style[attr]=icur+speed+'px'; } } if(flag){ clearInterval(obj.timer); if(fn){ fn(); } } },30);}

Answer 1

亲，课程视频的问题，你最好就在课程的问答就提出。主要那些都是和你看过同样视频的人，好回答这些问题