回答

首先要将文本按照/n分割成数组，然后进行数据去重操作，再重新转换成文本，代码如下：

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">

    <script type="text/javascript">
        var testarr = ["123", "bfw", "123", "bfw"];
        console.log(unique(testarr));

        function unique(ary) {
            var i = 0,
            gid = '_' + (+new Date) + Math.random(),
            objs = [],
            hash = {
                'string': {},
                'boolean': {},
                'number': {}
            },
            p,
            l = ary.length,
            ret = [];
            for (; i < l; i++) {
                p = ary[i];
                if (p == null) continue;
                tp = typeof p;
                if (tp in hash) {
                    if (!(p in hash[tp])) {
                        hash[tp][p] = 1;
                        ret.push(p)
                    }
                } else {
                    if (p[gid]) continue;
                    p[gid] = 1;
                    objs.push(p);
                    ret.push(p)
                }
            }
            for (i = 0, l = objs.length; i < l; i++) {
                p = objs[i];
                p[gid] = undefined;
                delete p[gid]
            }
            return ret
        }




    </script>

</head>
<body>

</body>
</html>