请老师检查

来源：3-11 项目作业

慕UI4313976

2021-09-21 16:42:02

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        const arr = [1, 1, '1', 17, true, true, false, false, 'true', 'a', {}, {}];
        console.log('原arr',arr);

        // for
        let newArr1 = [];
        for(let i =0 ; i < arr.length; i++){
            newArr1.indexOf(arr[i]) == -1 && newArr1.push(arr[i]);
        }
        console.log('for去重',newArr1);

        // reduce
        let newArr2 = arr.reduce((prev,next)=>{
            prev.indexOf(next) == -1 && prev.push(next);
            return prev;
        },[]);
        console.log('reduce去重',newArr2);

        // Set
        const s = new Set([...arr]);
        console.log('Set去重',s);
    </script>
</body>
</html>