test/test.html

<!DOCTYPE html>
<html>

<head lang="en">
    <meta charset="UTF-8">
    <title>Demos 代码演示、代码片段 - 读你 | 这世间唯有梦想和好姑娘不可辜负!</title>
    <meta name="Keyword" content="代码演示,代码片段,HTML5,CSS3,JavaScript,jQuery,Bootstrap,Angular,NodeJS,Node.js,ECMA2016,ES6,Promise,FetchAPI,Vue.js,React,React Native,webpack,gulp,ionic">
    <meta name="Author" content="dunizb">
    <meta name="website" content="http://www.dunizb.com">
    <meta name="Description" content="Demos 代码演示、代码片段 - 读你 | 这世间唯有梦想和好姑娘不可辜负!">
</head>

<body>
    <script src="http://cdn.bootcss.com/jquery/2.2.3/jquery.min.js"></script>
    <script type="text/javascript">
    var val = {
        '一周二次': 5,
        '一周三次': 3,
        '一周一次': 8,
        '一月一次': 4
    };
    var arr = [];
    if (!$.isEmptyObject(val)) {
        for (var item in val) {
            if (arr.length <= 10) {
                arr.push(item + ":" + val[item]);
            }
        }
        console.log(arr);
        var newArr = arr.sort(function(a, b) {
            a = a.split(':')[1];
            b = b.split(':')[1];
            return b - a;
        });
        arr = [], len = newArr.length;
        if (length > 10) len = 10;

        for (var i = 0; i < newArr.length; i++) {
            arr.push(newArr[i].split(':')[0]);
        }
        console.log(arr);
    }
    </script>
</body>

</html>