$("#filter").on('click', function(){
    var i;
    var a;
    var b;
    var price;
    a = $("#max_price").val();
    b = $("#min_price").val();
    var what = $("#filter_what").val();
    for (i = 1; i <= data.length; i++){
        price = parseInt(data[i - 1].about);
        if (((price < a) && (price > b) && (what == "Пох")) || ((price < a) && (price > b) && (what == data[i - 1].what)))
            $("tr:eq("+i+")").css("display", "table-row");
        else
            $("tr:eq("+i+")").css("display", "none");
    }
});