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

Set.prototype.values() - JavaScript | MDN

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values() 方法回傳一個 Iterator 物件，包含著 Set 物件中所有元素，由插入順序排序。

keys() 是這個方法的替身（為了與 Map 物件保持相似性）；他運行的完全一模一樣，回傳 Set 中元素的 values。

const set1 = new Set();
set1.add(42);
set1.add("forty two");

const iterator1 = set1.values();

console.log(iterator1.next().value);
// Expected output: 42

console.log(iterator1.next().value);
// Expected output: "forty two"

一個 Iterator 物件，包含著 Set 物件中所有元素，由插入順序排序。

var mySet = new Set();
mySet.add("foo");
mySet.add("bar");
mySet.add("baz");

var setIter = mySet.values();

console.log(setIter.next().value); // "foo"
console.log(setIter.next().value); // "bar"
console.log(setIter.next().value); // "baz"

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