Bits from integers 0-255

Inspired by http://weblog.bocoup.com/getting-bitwise-with-javascript/

by secretgspot

HTML

<div>
    <table>
        <tr>
            <th class="dec">dec.</th>
            <th>128</th>
            <th>64</th>
            <th>32</th>
            <th>16</th>
            <th>8</th>
            <th>4</th>
            <th>2</th>
            <th>1</th>
        </tr>
        <tr>
            <td class="dec" id="dec"></td>
            <td class="bit" id="bit-128"></td>
            <td class="bit" id="bit-64"></td>
            <td class="bit" id="bit-32"></td>
            <td class="bit" id="bit-16"></td>
            <td class="bit" id="bit-8"></td>
            <td class="bit" id="bit-4"></td>
            <td class="bit" id="bit-2"></td>
            <td class="bit" id="bit-1"></td>
        </tr>
    </table>
</div>

CSS

body {
    margin: 0.5em;
    margin-left: 0;
}

table {
    width: 100%;
    border-collapse: separate;
    margin-bottom: 0.6em;
}

th,
td {
    width: 10%;
    text-align: center;
    border: 1px solid #fff;
}

.dec {
    width: 1%;
    text-align: right;
    padding: 0 0.5em;
}

.bit {
    color: #fff;
}
.bit.one {
    background: green;
}
.bit.zero {
    background: red;
}

JavaScript

var next = $("table tr").eq(1);
var dec = $("#dec");

function render(n) {
    next.clone().children().removeProp("id").end().insertAfter(next);

    dec.html(n);
    var bitmask, bit;
    for (bitmask = 1; bitmask <= 128; bitmask <<= 1) {
        bit = n & bitmask ? 1 : 0;
        $("#bit-" + bitmask)
            .html(bit)
            .toggleClass("one", Boolean(bit))
            .toggleClass("zero", !bit);
    }
}

var num = 0;
var id = setInterval(function() {
    if (num === 255) {
        clearInterval(id);
    }
    render(num++);
}, 100);