let itemsArr = ["Milk", "Bread", "Potato"];
let quantityArr = [5, 2, 3];
for (i = 0; i <= itemsArr.length; i++) {
if (i <= itemsArr.length)
console.log(itemsArr[i] + " - " + quantityArr[i]);
}它应该
打印以下结果：
Milk - 5
Bread - 2
Potato - 3
但为什么它是打印以下结果：
Milk - 5
Bread - 2
Potato - 3
undefined - undefined
请帮忙！