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                # 淺拷貝 ### 方法一 ~~~ var objA = { a: 'aa', b: 'bb' }; var objB = {}; // 現在想把對象A的值復制給B,由于對象A的兩個值都是原始類型,用淺復制即可 function copy(sub, sup) { for (var key in sup) { sub[key] = sup[key]; } } copy(objB, objA); ~~~ ### 方法二 ~~~ Object.assign(); ~~~ ### 方法三 ~~~ _.clone(); ~~~ ### 方法四 數組中`concat`和`slice`方法 ### 方法五 展開運算符 ~~~ var arr = [{a: 'a', b: 'b'}]; var target = [...arr]; ~~~ # 深拷貝 ### 方法一 ``` JSON.parse(JSON.stringify(obj)) ``` ### 方法二 ``` **lodash —— \_.cloneDeep() ```
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