数组中去掉相同的元素，排序

从大到小排序

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>从大到小排序</title>
    <script src="../plugins/jquery-2.1.1.min.js"></script>

    <script>

        var datanum = [12,45,79,46,49,78,16];
        for(var z = 0; z < datanum.length; z++){
            for (var j = z + 1; j < datanum.length; j++){
                var p;
                if (datanum[z] < datanum[j])
                {
                    p = datanum[z];

                    datanum[z] = datanum[j];

                    datanum[j] = p;
                }
            }
        }
        alert(datanum);
    </script>
</head>
<body>


</body>
</html>

从小到大排序

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>从小到大排序</title>
    <script src="../plugins/jquery-2.1.1.min.js"></script>

    <script>

        var datanum = [12,45,79,46,49,78,16];
        for(var z = 0; z < datanum.length; z++){
            for (var j = z + 1; j < datanum.length; j++){
                var p;
                if (datanum[z] > datanum[j])
                {
                    p = datanum[z];

                    datanum[z] = datanum[j];

                    datanum[j] = p;
                }
            }
        }
        alert(datanum);
    </script>
</head>
<body>


</body>
</html>

去掉数组中相同的

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>从大到小排序</title>
    <script src="../plugins/jquery-2.1.1.min.js"></script>


    <script>


        function uniq_fast(a) {
            var seen = {};
            var out = [];
            var len = a.length;
            var j = 0;
            for(var i = 0; i < len; i++) {
                var item = a[i];
                if(seen[item] !== 1) {
                    seen[item] = 1;
                    out[j++] = item;
                }
            }
            return out;
        }


        var arr = [112,'你好',112,112,34,'你好','str','str1'];
        alert(uniq_fast(arr));
    </script>
</head>
<body>



</body>
</html>

数组中去掉相同的元素， 排序

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数组中去掉相同的元素，排序