SOURCE

let memberList = [
    {
        userid: 1,
        name: '张胜男'
    },
    {
        userid: 2,
        name: '下下'
    },
    {
        userid: 3,
        name: '豆豆'
    },
    {
        userid: 2,
        name: '下下'
    },
    {
        userid: 1,
        name: '张胜男'
    }
]

memberList = memberList.reduce((pre,cur) => {
    console.log(pre)
    // console.log(cur)
    if(pre == cur.userid){
        memberList.pop(pre)
    }
})

console.log(memberList)