js数组去重几种方法

 

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<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>
        let arr = [0, 2, 2, 34, 45, 44, 0]
        console.log([...new Set(arr)]);//[0, 2, 34, 45, 44]
        console.log(Array.from(new Set(arr)));//[0, 2, 34, 45, 44]
        

        function unArr(arr) {
            let arrs = []
            arr.forEach((item) => {
                if (!arrs.includes(item)) {
                    arrs.push(item)
                }
            })
            return arrs
        }
        console.log(unArr(arr));

        function unArr2(arr) {
            let arrs = []
            arr.forEach((item) => {
                if (arrs.indexOf(item) === -1) {
                    arrs.push(item)
                }
            })
            return arrs
        }
        console.log(unArr2(arr));

    </script>
</body>

</html>

 

posted @ 2020-12-14 10:48  南柯Dream丶  阅读(21)  评论(0)    收藏  举报