How to get the value of an option in javascript parsing

Good day am having an HTML code in which i intend to get the innerText of a selected option

<div class="bag-option">
<div class="bag-option-label">colour:</div>
<div class="bag-option-control">
    <select name='select-colour-0' id='select-colour-0' onchange="onColourSelected(this, '0', '1', 'style-img-thb-', '_WLG.jpg', '_WXL.jpg', '_SKC.jpg');displayUpdateMsg();return false;">
        <option value="0" selected>orchid pink</option>
    </select>
</div>

via Chebli Mohamed