<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>Set</title> </head> <body> <script> var st = new Set([1,2,3,3]);//新建Set数据 console.log(st);//自动清除重复项 Set {1, 2, 3} let obj = {‘abc‘:111}; st.add(obj);//添加 console.log(st);//Set {1, 2, 3, Object {abc: 111}} // st.delete(obj);//删除 // console.log(st); //Set {1, 2, 3} for(let o of st){//遍历 console.log(o);//1,2,3,Object {abc: 111} } let keysItem = st.keys();//获得key值 console.log(keysItem);//SetIterator {1, 2, 3, Object {abc: 111}} let valuesItem = st.values();//获得value值 console.log(valuesItem);//SetIterator {1, 2, 3, Object {abc: 111}} let entriesItem = st.entries();//获得key和value数组结构数据 console.log(entriesItem);//SetIterator {[1, 1], [2, 2], [3, 3], [Object, Object]} st.clear();//清空Set数据 console.log(st);//Set {} </script> </body> </html>
原文：https://www.cnblogs.com/xingxingclassroom/p/10386810.html