如何从Flip Switch或Toggle Switch获取选定值

<div class="table-thing with-label widget uib_w_114 d-margins" data-uib="app_framework/flip_switch" data-ver="1">
    <label class="narrow-control label-inline">Notifications</label>
    <div class="wide-control">
        <input type="checkbox" class="toggle" id="af-flipswitch-1" name="af-flipswitch-1" checked="checked">
        <label for="af-flipswitch-1" data-off="Off" data-on="On">
            <span></span>
        </label>
    </div>
</div>
<div class="table-thing with-label widget uib_w