filter()数组去重的方法

    var arr1 = [1, 2, 3, 1, 2, 4, NaN, undefined, NaN, undefined]
    function unique(arr) {
      const res = new Map()
      return arr.filter((a) => !res.has(a) && res.set(a))
    }
    var newArr = unique(arr1)
    console.log(newArr);

var array1 = [
      { "id": 0, "info": "dsfffffffffffhd", "done": false },
      { "id": 1, "info": "dsfffffffffffhd", "done": true },
      { "id": 22, "info": "dsfffffffffffhd", "done": false },
      { "id": 3, "info": "dsfffffffffffhd", "done": true },
      { "id": 42, "info": "dsfffffffffffhd", "done": false },
      { "id": 53, "info": "dsfffffffffffhd", "done": false },
      { "id": 6, "info": "dsfffffffffffhd", "done": true }
    ]

    var ar = array1.filter(function(value, index, arr) {
      return value.done === true
    })
    console.log(ar);