JS运动框架-move3.js

/**
 * Created by zhanghaibin on 16/12/5.
 */
//完美运动框架
function getStyle(obj,attr) {
    if(obj.currentStyle){
        return obj.currentStyle[attr];
    }else{
        return getComputedStyle(obj,false)[attr];
    }
};
function startMove(obj,json,fn) {
    clearInterval(obj.timer);
    obj.timer=setInterval(function () {
        var bStop=true; //这一次运动就结束了---所有的值都到达了
        for(var attr in json){
            //1.取当前值
            var iCur=0;
            if(attr=='opacity'){
                iCur=parseInt(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]){
                bStop=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(bStop){
            clearInterval(obj.timer);
            if(fn){
                fn();
            };
        }
    },30)
};