Javascript过滤复选框值的内容

I have code like this

我有这样的代码

<div id="filter">
</div>
<div id="items">
    <div class="item">
        <h2>Orange</h2>
        <img src="orange.png" alt="" />
    </div>
    <div class="item">
        <h2>Banana</h2>
        <img src="banana.png" alt="" />
    </div>
</div>
<div id="filt