如何在 JavaScript 中创建一个集合的浅拷贝
要创建集合的浅表副本，请将原始集合作为参数传递给 Set() 构造函数，例如 const cloned = new Set(oldSet)。 Set() 构造函数接受一个可迭代对象，例如另一个集合，并将所有元素添加到新集合中。
const set1 = new Set(['one', 'two', 'three']);
const cloned = new Set(set1);
console.log(cloned); // 👉️ {'one', 'two', 'three'}
我们使用 Set() 构造函数来创建 Set 的浅表副本。
Set() 构造函数采用的唯一参数是一个可迭代对象，例如数组、字符串或另一个 Set。
将可迭代对象传递给构造函数后，可迭代对象中的所有唯一值都会添加到新的集合中。
新的集合对象在内存中的位置完全不同，向其添加元素不会向原始集合添加元素。
const set1 = new Set(['one', 'two', 'three']);
const cloned = new Set(set1);
console.log(cloned); // 👉️ {'one', 'two', 'three'}
cloned.add('four');
console.log(cloned); // 👉️ {'one', 'two', 'three', 'four'}
console.log(set1); // 👉️ {'one', 'two', 'three'}
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