90-js去重对象

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let person = [
     {id: 0, name: "小明"},
     {id: 1, name: "小张"},
     {id: 2, name: "小李"},
     {id: 3, name: "小孙"},
     {id: 1, name: "小周"},
     {id: 2, name: "小陈"},   
];

1 向前取值，忽略后面重复的对象

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function fn1(arr){
  var obj={}
  var re=arr.reduce((cur,next)=>{
    if(!obj[next.id]){
      obj[next.id]=true
      cur.push(next)
    }
    return cur
  },[])

  return re
}

console.log(fn1(person));

结果

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[ { id: 0, name: '小明' },
  { id: 1, name: '小张' },
  { id: 2, name: '小李' },
  { id: 3, name: '小孙' } ]

2 往后取值，忽略前面重复的对象

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function fn2(arr){
  var re=[]
  for (let i = 0; i < arr.length; i++) {
    for(let j=i+1;j<arr.length;j++){
      if(arr[i]['id']==arr[j]['id']){
        i++
        j=i
      }
    }
    re.push(arr[i])
  }
  return re
}

console.log(fn2(person));

结果：

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[ { id: 0, name: '小明' },
  { id: 3, name: '小孙' },
  { id: 1, name: '小周' },
  { id: 2, name: '小陈' } ]