var obja = [

  {USER:"bob",  SCORE:2000, TIME:32,    AGE:16, COUNTRY:"US"},

  {USER:"jane", SCORE:4000, TIME:35,    AGE:16, COUNTRY:"DE"},

  {USER:"tim",  SCORE:1000, TIME:30,    AGE:17, COUNTRY:"UK"},

  {USER:"mary", SCORE:1500, TIME:31,    AGE:19, COUNTRY:"PL"},

  {USER:"joe",  SCORE:2500, TIME:33,    AGE:18, COUNTRY:"US"},

  {USER:"sally",    SCORE:2000, TIME:30,    AGE:16, COUNTRY:"CA"},

  {USER:"yuri", SCORE:3000, TIME:34,    AGE:19, COUNTRY:"RU"},

  {USER:"anita",    SCORE:2500, TIME:32,    AGE:17, COUNTRY:"LV"},

  {USER:"mark", SCORE:2000, TIME:30,    AGE:18, COUNTRY:"DE"},

  {USER:"amy",  SCORE:1500, TIME:29,    AGE:19, COUNTRY:"UK"}

];

​

var sorto = {

  SCORE:"desc",TIME:"asc", AGE:"asc"

}; 

​

// extended from

// http://stackoverflow.com/questions/2784230/javascript-how-do-you-sort-an-array-on-multiple-columns

Array.prototype.keySort = function(keys) {

​

    keys = keys || {};

    // via

    // http://stackoverflow.com/questions/5223/length-of-javascript-object-ie-associative-array

    var obLen = function(obj) {

        var size = 0, key;

        for (key in obj) {

            if (obj.hasOwnProperty(key))

                size++;

        }

        return size;

    };

​

    // avoiding using Object.keys because i guess did it have IE8 issues?

    // else var obIx = fucntion(obj, ix){ return Object.keys(obj)[ix]; } or

    // whatever

    var obIx = function(obj, ix) {

        var size = 0, key;

        for (key in obj) {

            if (obj.hasOwnProperty(key)) {

                if (size == ix)

                    return key;

                size++;

            }

        }

        return false;

    };

​

    var keySort = function(a, b, d) {

        d = d !== null ? d : 1;

        // a = a.toLowerCase(); // this breaks numbers

        // b = b.toLowerCase();

        if (a == b)

            return 0;

        return a > b ? 1 * d : -1 * d;

    };

​

    var KL = obLen(keys);

​

    if (!KL) return this.sort(keySort);

​

    for ( var k in keys) {

        // asc unless desc or skip

        keys[k] = 

                keys[k] == 'desc' || keys[k] == -1  ? -1 

              : (keys[k] == 'skip' || keys[k] === 0 ? 0 

              : 1);

    }

​

    this.sort(function(a, b) {

        var sorted = 0, ix = 0;

​

        while (sorted === 0 && ix < KL) {

            var k = obIx(keys, ix);

            if (k) {

                var dir = keys[k];

                sorted = keySort(a[k], b[k], dir);

                ix++;

            }

        }

        return sorted;

    });

    return this;

};

​

// extended from

// http://stackoverflow.com/questions/957537/how-can-i-print-a-javascript-object

var print = function(obj, delp, delo, ind){

    delp = delp!=null ? delp : "\t"; // property delimeter

    delo = delo!=null ? delo : "\n"; // object delimeter

    ind = ind!=null ? ind : " "; // indent; ind+ind geometric addition not great for deep objects

    var str='';

    for(var prop in obj){

        if(typeof obj[prop] == 'string' || typeof obj[prop] == 'number'){

          var q = typeof obj[prop] == 'string' ? "" : ""; // make this "'" to quote strings

          str += ind + prop + ': ' + q + obj[prop] + q + '; ' + delp;

        }else{

          str += ind + prop + ': {'+ delp + print(obj[prop],delp,delo,ind+ind) + ind + '}' + delo;

        }

    }

    return str;

};

​

console.log(print(obja));

document.write("<pre>BEFORE:\n"+print(obja)+"</pre>");

​

document.write("<pre>SORTO:\n"+print(sorto)+"</pre>");

​

obja.keySort(sorto);

​

console.log(print(obja));

document.write("<pre>AFTER:\n"+print(obja)+"</pre>");

​

​

​