陣列是否被複製？
重要性：3
這段程式碼將會顯示什麼？
let fruits = ["Apples", "Pear", "Orange"];
// push a new value into the "copy"
let shoppingCart = fruits;
shoppingCart.push("Banana");
// what's in fruits?
alert( fruits.length ); // ?結果是 4
let fruits = ["Apples", "Pear", "Orange"];
let shoppingCart = fruits;
shoppingCart.push("Banana");
alert( fruits.length ); // 4這是因為陣列是物件。所以 shoppingCart 和 fruits 都是對同一個陣列的參照。