代码

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
        function repEat(arr) {
            var emptyArr = [];
            for (let i = 0; i < arr.length; i++) {
                for (let j = i + 1; j < arr.length; j++) {
                    if (arr[i] === arr[j] && emptyArr.indexOf(arr[j]) === -1) {
                        emptyArr.push(arr[i]);
                    }
                }
            }
            return emptyArr;
        }
        var newArr = [1, 2, 4, 4, 3, 3, 1, 5, 3];
        console.log(repEat(newArr));
    </script>

</body>

</html>

运行结果

20230913找出数组中的重复元素_html