index.html

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

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>

<body>
    <script>
        let data = [];
        for (let index = 0; index < 10; index++) {
            data.push(parseInt(parseFloat(Math.random().toFixed(2)) * 100));
        }
        let arr = Array.from(data);
        data = [...data, ...arr];
        console.log(data);
        let startTimestamp = new Date().getTime();
        function removeDistinct(data) {
            let obj = {};
            let resArray = [];
            for(let item of data){
                if(!obj[item]){
                    resArray.push(item);
                    obj[item] = item;
                }
            }
            return resArray;
        }
        console.log(removeDistinct(data));
        let endTimestamp = new Date().getTime();
        console.log("去重程序的执行时间是：", (endTimestamp - startTimestamp) + "毫秒");
    </script>
</body>

</html>