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JavaScript Set集合 集合参考


完整集合参考

2025 年 7 月修订

方法 描述
new Set() 创建一个新集合
add() 向集合中添加一个新元素
clear() 从集合中移除所有元素
delete() 从集合中移除一个元素
difference() 返回两个集合之间的差值
entries() 返回一个迭代器,其中包含集合中所有 [value,value] 对
forEach() 为集合中的每个元素调用回调函数
has() 如果值存在,则返回 true
intersection() 返回两个集合的交集
isDisjointFrom() 如果一个集合中没有元素属于另一个集合,则返回 true
isSubsetOf() 如果一个集合是另一个集合的子集,则返回 true
isSupersetOf() 如果一个集合是另一个集合的超集,则返回 true
keys() 与 values() 相同
symmetricDifference() 返回两个集合的对称差值
union() 返回两个集合的并集
values() 返回一个包含集合中值的迭代器

集合只有一个属性:

属性 描述
size 返回集合中元素的数量

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