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

Set.prototype.clear() - JavaScript | MDN

Baseline Widely available

clear() 方法會從一個 Set 物件中移除其所有元素。

const set1 = new Set();
set1.add(1);
set1.add("foo");

console.log(set1.size);
// Expected output: 2

set1.clear();

console.log(set1.size);
// Expected output: 0

undefined。

var mySet = new Set();
mySet.add(1);
mySet.add("foo");

mySet.size; // 2
mySet.has("foo"); // true

mySet.clear();

mySet.size; // 0
mySet.has("bar"); // false

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