数组对象中根据特定属性值判断是否重复
给定一个数组对象 A，其包含多个对象，每个对象具有 id、name 和 address 属性。任务是根据 name 属性判断是否存在重复。
若存在重复，则保留并返回所有 name 值相同的对象，保存于新数组中。否则，删除重复项。
实现：
var A = [
{ id: 1, name: "张三", address: "北京" },
{ id: 2, name: "李四", address: "上海" },
{ id: 3, name: "张三", address: "杭州" },
{ id: 4, name: "王五", address: "深圳" },
{ id: 5, name: "李四", address: "厦门" },
{ id: 6, name: "张三", address: "广州" },
];
const result = Object.values(A.reduce((acc, cur) => ((acc[cur.name] || (acc[cur.name] = [])).push(cur), acc), []))
.filter(item => item.length > 1)
.flat();结果：
[
{
"id": 1,
"name": "张三",
"address": "北京"
},
{
"id": 3,
"name": "张三",
"address": "杭州"
},
{
"id": 6,
"name": "张三",
"address": "广州"
},
{
"id": 2,
"name": "李四",
"address": "上海"
},
{
"id": 5,
"name": "李四",
"address": "厦门"
}
] 
