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

Set.prototype.size - JavaScript | MDN

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Set 实例的 size 访问器属性将返回该集合中（唯一的）元素的个数。

const set1 = new Set();
const object1 = {};

set1.add(42);
set1.add("forty two");
set1.add("forty two");
set1.add(object1);

console.log(set1.size);
// Expected output: 3

size 的值是一个整数，表示 Set 对象有多少条目。size 的 set 访问函数是 undefined；你无法改变这个属性。

const mySet = new Set();
mySet.add(1);
mySet.add(5);
mySet.add("some text");

console.log(mySet.size); // 3

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