<div id="one" data-biind="click:clickevent">
<input type="checkbox"><span>有事請勾我</span>
</div>

<div id="one">
<div id="two" data-bind="click:clickevent"></div>
<div id="three">
<input type="checkbox"/> <span>有事請勾我</span>
</div>
</div>