javascript生成环形坐标

//num 一圈获取几个坐标function getLocArr(num) {var arr = [];var r = 200;var du = 360 / num;for (var times = 0; times < num; times++) {    var hudu = (2 * Math.PI / 360) * (du * times - 180);    var x = Math.sin(hudu) * r + r;    var y = Math.cos(hudu) * r + r;    arr.push(x + " " + y);}return arr;}