autojs怎么保存组数并判断是否变动

function countAppleSales(arr) {
var i = 0;
while (true) {
yield arr[i];
i = (i+1) % arr.length;
}
}
function aaa(){
var members = [21,2,3];
var a = countAppleSales(members);
console.log(a.next());
console.log(a.next());
console.log(a.next());
输出21 2 3
怎么保存这组数据当
再次
console.log(a.next());
第一次的时候如果值不等于21
打印log(不等于)
第二次console.log(a.next());
值等于2
log(不等于)
依次类推，
如何实现呢