方法一：

1 handleArr () {
2     let arr = [[1], [1], [1, 2], [3], [1], [2, 4, 6], [3]]
3     let obj = {}
4     arr.forEach(item => {
5         obj[item] = item
6     })
7     console.log(Object.values(obj))
8 }    

方法二：

 1 handleArr () {
 2     let arr = [[1], [1], [1, 2], [3], [1], [2, 4, 6], [3]]
 3     let hash = {}
 4     let result = []
 5     arr.forEach(item => {
 6       if (!hash[item]) {
 7         result.push(item)
 8         hash[item] = true
 9       }
10     })
11     console.log(result)
12 }

方法三：

 1 handleArr () {
 2     let arr = [[1], [1], [1, 2], [3], [1], [2, 4, 6], [3]]
 3     let result = []
 4     for (var i = 0; i < arr.length; i++) {
 5       for (var j = 0; j < arr[i].length; j++) {
 6         var v = this.arr[i][j]
 7         if (!result.includes(v)) {
 8           result.push(v)
 9         }
10       }
11     }
12     console.log(result)
13 }

方法四：

1 handleArr (arr) {
2     let obj = {}
3     return arr.filter(item => {
4       if (!obj[item.toString()]) {
5         obj[item.toString()] = item.toString()
6         return item
7       }
8     })
9 }

1 let arr = [[1], [1], [1, 2], [3], [1], [2, 4, 6], [3]]
2 console.log(this.handleArr(arr))