indexOf数组去重

 // indexOf数组去重
        function unique(arr) {
            var newArr = []
            for (var i = 0; i < arr.length; i++) {
                if (newArr.indexOf(arr[i]) == -1) {
                    newArr.push(arr[i])
                }
            }
            return newArr
        }
        var c = unique([1, 1, 2, 5, 6, 6, 8, 8, 9, 1, 9])
        console.log(c);