javascript數組的普通方法

1.請判斷以下對象是不是數組(Array.isArray)javascript var arr = {a:1,b:2} var arr2 = [1,2,3]; var arr3 = [{a:1},{b:2}]; console.log(Array.isArray(arr)); //false console.log(Array.isArray(arr2)); //true

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