个回答

• 慕粉18813290620

  2016-08-03 12:44:19

  已采纳

  function startMove(obj,json,fn){

  var flag=true;//假设所有都到达目标值

  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:'+attr+')';//针对iE

  obj.style.opacity=(icur+speed)/100;

  }else{

     obj.style[attr]=icur+speed+'px';

  }

  }

   if(flag)

   {

  clearInterval(obj.timer);

     if(fn)

  {

  fn();

  }  

    }

   

  },30)

     

  };

  //获取样式

  function getStyle(obj,attr){

  //IE

  if(obj.currentStyle){

  obj.currentStyle[attr];

  }else{ //FF

  return getComputedStyle(obj,false)[attr];

  }

  }

  
  

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