JS判断数组是否有重复项

ruoyan8899

于 2021-09-27 16:50:41 发布

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分类专栏：学习笔记文章标签： javascript html5 html

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<!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>
        var Narr = new Array("111","ff","222","aa","222");
        if(repetition(Narr)){
            alert('有重复项')
        }
        // 验证重复元素函数，有重复返回true；否则返回false
        function repetition(a){
            return /(\x0f[^\x0f]+)\x0f[\s\S]*\1/.test("\x0f"+a.join("\x0f\x0f") +"\x0f");
        }
    </script>

</body>
</html>