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                >[success] # 函數參數傳值 >[danger] ##### 基本類型 ~~~ const a = 1 function t(a){ a =2 } // 下面打印結果 為1,當基本類型時候,函數體復制了一份參數值 // 任何操作都不會影響原參數的實際值 console.log(a); ~~~ >[danger] ##### 引用類型 ~~~ 1.當函數參數是引用類型的時候,函數體內修改這個參數值的某個值時候, 將會對原來的參數進行修改 2.如果直接修改這個參數的引用地址,相當于在函數內創建了一個新的引用 任何操作都不會影響原來值 ~~~ ~~~ let a = { name: 'Julia', age: 20 } function change(o) { o.age = 24; o = { name: 'Kath', age: 30 } return o; } let b = change(a); console.log(b.age); // 30 console.log(a.age); // 24 ~~~
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