Function that returns array of top 3 values of an object

gistfile1.js

var items = {
    'a': 5,
    'b': 10,
    'c': 4,
    'd': 11
},
tempArr = [],
returnArr = [];

function sortObject(items) {
    for (var key in items) {
        if (items.hasOwnProperty(key)) { // filter

            tempArr.push({name: key, value: items[key]});
        }
    }

    tempArr.sort(function(a, b) {
        if (a.value < b.value)
          return 1;

        if (a.value > b.value)
          return -1;

        return 0;
    });

    for (var i = 0; i < 3; i++) {
        returnArr.push(tempArr[i].name);
    };

    return returnArr;
}

sortObject(items);