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                [TOC] > Sat May 15 2021 22:54:44 GMT+0800 (GMT+08:00) JavaScript 的數組需要留意的是原數組的改變與否,一個很典型的例子: ```js let arr1 = [1,2,3,4,5] let arr2 = arr1 arr2.pop() arr1.push("A") console.log("arr1:") console.table(arr1) console.log("arr2:") console.table(arr2) ``` arr1 和 arr2 都變了,`arr2 = arr1` 并不是對 arr1 的克隆,在內存中,arr1 和 arr2 都指向同一個位置致使一個改變了另一個也跟著改變(讀取的是同一數據)。 我們將其改為拷貝: ```js let arr1 = [1,2,3,4,5] let arr2 = Array.from(arr1) // ok // let arr2 = [...arr1] // ok // let [...arr2] = arr1 // ok // let arr2 = arr1.concat() //ok //arr2.pop() arr1.pop() console.log("arr1:") console.table(arr1) console.log("arr2:") console.table(arr2) ``` 至于排序、分拆、查值等倒是多試試就出來了,但這種情況對沒系統學過 JavaScript 的朋友會很困惑。你猜的沒錯,包括我自己…… > `[{...},...]` 這種類型的數組,大家自行研究吧……
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