Wie füge ich mit jQuery Text zum Datenattribut hinzu?

$(".pin_lists div").each(function() {
    $(this).attr("data-col", $($(".pin_head").children()[$(this).index()]).find("strong").text());
});

* {
    margin:0px;
    padding:0px;
    box-sizing:border-box;
}
.pin_head {
    background: #eee;
}
.pin_head:after {
    content:"";
    display:block;
    clear:both;
    height:0;
}
.pin_head > div {
    float:left;
    margin-left:-1px;
    border-left: 1px solid #ddd;
}
.pin_head > div strong {
    font-size: 13px;
    padding:0 10px;
    line-height:50px;
    display:block;
}
.pin_head > div.pin_id strong {
    line-height: 50px;
    padding: 0;
    text-align: center;
}
.pin_head > div.pin_id {
    margin:0;
    border-left:0px none;
}
.pin_id {
    width:7%;
    border-left: 0px none;
}
.pin_pro {
    width:14%;
}
.pin_date {
    width:7%;
}
.pin_fname {
    width:12%;
}
.pin_lname {
    width:12%;
}
.pin_email {
    width:11%;
}
.pin_phone {
    width:11%;
}
.pin_pass {
    width:20%;
}
.pin_lists ul {
    padding:0;
    margin:0;
}
.pin_lists ul li {
    list-style:none;
    border-bottom: 1px solid #ddd;
    overflow:hidden;
}
.pin_lists ul li:last-child {
    border-bottom:0px none;
}
.pin_lists ul li:nth-child(even) {
    background: #fdfbfc;
}
.pin_lists ul li:after {
    content:"";
    display:block;
    clear:both;
    height:0;
}
.pin_lists ul li > div {
    float:left;
    margin-left:-1px;
    border-left: 1px solid #ddd;
    padding:7px 5px;
    min-height:77px;
    word-wrap:break-word;
    margin-bottom: -99999px;
    padding-bottom: 100004px;
}
.pin_delete {
    width:6.7%;
}
.pin_delete a {
    display:block;
    text-transform:uppercase;
    text-align:center;
    line-height:44px;
    font-weight:bold;
}
.pin_lists ul li .pin_id {
    font-weight:bold;
    line-height:44px;
    text-align:center;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="pin_head">
    <div class="pin_id"><strong>Order ID</strong>

    </div>
    <div class="pin_pro"><strong>Product Name</strong>

    </div>
    <div class="pin_date"><strong>Dated</strong>

    </div>
    <div class="pin_fname"><strong>First Name</strong>

    </div>
    <div class="pin_lname"><strong>Last Name</strong>

    </div>
    <div class="pin_email"><strong>Email</strong>

    </div>
    <div class="pin_phone"><strong>Phone</strong>

    </div>
    <div class="pin_pass"><strong>Password</strong>

    </div>
</div>
<div class="pin_lists">
    <ul>
        <li>
            <div class="pin_id">654</div>
            <div class="pin_pro">Low Voltage</div>
            <div class="pin_date">2015-08-07</div>
            <div class="pin_fname">John</div>
            <div class="pin_lname">Tait</div>
            <div class="pin_email">johnson@mail.com</div>
            <div class="pin_phone">123-456-789</div>
            <div class="pin_pass">passcode</div>
            <div class="pin_delete"><a href="#">Edit</a>
            </div>
        </li>
        <li>
            <div class="pin_id">654</div>
            <div class="pin_pro">Low Voltage</div>
            <div class="pin_date">2015-08-07</div>
            <div class="pin_fname">John</div>
            <div class="pin_lname">Tait</div>
            <div class="pin_email">johnson@mail.com</div>
            <div class="pin_phone">123-456-789</div>
            <div class="pin_pass">passcode</div>
            <div class="pin_delete"><a href="#">Edit</a>
            </div>
        </li>
    </ul>
</div>