javascript中的缓动效果实现程序(3)

 var timer = null;
        var b=0,c=400,d=100,t=0;
        var drag = $("drag");
        function run() {
            drag.style.left = Math.ceil(Tween.Circ.easeInOut(t,b,c,d)) + "px";
            if(t<d){
                t++;
            }else{
                clearInterval(timer);
            }
        }
var timer = setInterval(run, 20);

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