<select id="sltProvince">
        <option value="1" data-flag="0">山东</option>
        <option value="2" data-flag="101">湖北</option>
        <option value="3" data-flag="2">安徽</option>
    </select>

window.onload = function (parameters) {
        var sltProvice = document.getElementById("sltProvince");
        var ops = sltProvice.getElementsByTagName("option");
        var arrOps = Array.prototype.slice.call(ops, 0);
        arrOps.sort(function (a, b) {
            return a.attributes["data-flag"].value - b.attributes["data-flag"].value;
        });
        sltProvice.options.length = 0;
        arrOps.map(function (op) {
            sltProvice.appendChild(op);
        });
    }