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                # 深拷貝 >[warning]深拷貝是一層一層的拷貝,每一層都會獨立開辟一個空間 <br> ```javascript // 深拷貝是一層一層的拷貝 // 定義個對象 var obj1 = { name: "wc", age: 3, like: ["吃飯", "睡覺", "打豆豆"], eat: { name: "麻辣燙", price: 2 } } // 創建個空的對象放拷貝過來的內容 var obj2 = {}; // 封裝函數 function deepCopy(source, target) { // 循環遍歷source for (var key in source) {//in 獲取到的是私有屬性跟公有屬性 // 只需要私有屬性,作判斷 if (source.hasOwnProperty(key)) { // 判斷是不是引用數據類型,是的話調用函數進行循環遍歷拷貝(遞歸) if(typeof source[key] == "object"){ // 做判斷,target是數組的話,定義個空數組存放屬性,是對象的話定義個空對象存放 target[key] = Array.isArray ? [] : {}; // 調用函數,遞歸 deepCopy(source[key],target[key]); }else{ // 值類型數據 target[key] = source[key]; } } } } // 調用函數 deepCopy(obj1,obj2); // 查看對象的屬性 console.log(obj2); // 修改obj2的值 obj2.eat.name = "烤肉"; console.log(obj1); ``` <br> ## 內存圖 ![](https://img.kancloud.cn/b5/30/b5300c558872794db6dafa68b55b7e6e_937x684.png)
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