JavaScript 深入解析：Copy by Value、Copy by Reference、Shallow Copy、Deep Copy
// 1️⃣ Copy by Value (值複製)
// 適用於原始型別 (Primitive Types)：Number, String, Boolean, Null, Undefined, Symbol, BigInt
let a = 10;
let b = a; // 這裡是值複製，b 獲得 a 的副本
b = 20; // 改變 b 不會影響 a
console.log(a); // 10
console.log(b); // 20
// 2️⃣ Copy by Reference...
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