Edit in JSFiddle

$(function () {
    $("#Btn_AddBColor").click(function () {
        $("div.demo").addClass("bcolor");
        $("#demo").click();
    });

    $("#Btn_RemoveBColor").click(function () {
        $("div.demo").removeClass("bcolor");
        $("#demo").click();
    });

    $("#demo").click(function () {
        var div = $(this);
        var html = "width:" + div.width() +
            "height:" + div.height() +
            "color:" + div.css("color") + 
            "background-color:" + div.css("backgroundColor");
        $("#msg").html(html);
    });
});
<input id="Btn_AddBColor" type="button" value="Add BColor" />
<input id="Btn_RemoveBColor" type="button" value="Remove BColor" />
<div id="demo" class="demo">demo</div>
<div id="msg"></div>
div.demo {
    border:solid 1px black;
    color:red;
    width:300px;
    height:300px;
}

.bcolor {
    background-color:blue;
}