圆形轨迹函数

# 圆形轨迹

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function yuan(obj,x,y,s){

var num = 0;

setInterval(function(){

var a = Math.sin(num*Math.PI/180)*s;

console.log("a:"+a)

var b = Math.cos(num*Math.PI/180)*s;

console.log("b:"+b)

obj.style.top=y+a+"px";

obj.style.left=(x-250)+b+"px";

num++;

if (num>360)

{

num=0

}

}, 50)

}

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