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Showing content from https://developer.mozilla.org/zh-TW/docs/Web/JavaScript/Reference/Global_Objects/Array/reverse below:

Array.prototype.reverse() - JavaScript | MDN

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reverse() 方法會原地（in place）反轉（reverse）一個陣列。陣列中的第一個元素變為最後一個，而最後一個元素則變成第一個。

const array1 = ["one", "two", "three"];
console.log("array1:", array1);
// Expected output: "array1:" Array ["one", "two", "three"]

const reversed = array1.reverse();
console.log("reversed:", reversed);
// Expected output: "reversed:" Array ["three", "two", "one"]

// Careful: reverse is destructive -- it changes the original array.
console.log("array1:", array1);
// Expected output: "array1:" Array ["three", "two", "one"]

反轉後的陣列。

reverse 方法將原地（in place）變換（transposes）呼叫此方法的陣列物件之元素至其顛倒的位置，改變原陣列後，並回傳此陣列之參考位址（reference）。

下列範例建立了一個包含三個元素的陣列 a，接著反轉此陣列。呼叫 reverse() 會回傳一個反轉後的原陣列 a 之參考。

var a = ["one", "two", "three"];
var reversed = a.reverse();

console.log(a); // ['three', 'two', 'one']
console.log(reversed); // ['three', 'two', 'one']

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