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                ## 怎么判斷一個object是否是數組(array)? > 方法一: instanceof > instanceof 用于判斷一個變量是否某個對象的實例 ~~~ var arr=[]; console.log(arr instanceof Array) //返回true ~~~ > 方法二:constructor > constructor 屬性返回對創建此對象的數組函數的引用,就是返回對象相對應的構造函數 ~~~ console.log([].constructor == Array) ~~~ > 方法三:Array.isArray() > 用于確定傳遞的值是否是一個 Array。 > obj > 需要檢測的值,如果對象是 Array,則為true; 否則為false。 ~~~ Array.isArray(obj) ~~~
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