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                ```html <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>深拷貝</title> </head> <body> <script> //深拷貝:把一個對象中的屬性,依次的,一個一個的復制到另一個對象中 var obj1 = { name: "風斯托羅斯基", age: 20, car: ["奔馳", "寶馬", "奧拓"], dog: { name: "哮天犬", age: 2, color: "黑色" } }; var obj2 = {}; //把a中的拷貝到b中 function extend(a, b) { //遍歷a這個對象中所有的屬性 for (var key in a) { var item = a[key]; //獲取了a對象中的屬性 if (item instanceof Array) { b[key] = []; //在b對象中添加數組 extend(item, b[key]); } else if (item instanceof Object) { b[key] = {}; extend(item, b[key]); } else { b[key] = item; } } } extend(obj1, obj2); // 修改對象內容,另一個對象不會受到任何影響 console.dir(obj2); console.dir(obj1); </script> </body> </html> ```
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