我想要的
img*3
<div>
<img src="" alt="">
<img src="" alt="">
<img src="" alt="">
</div>
实际上
img*3
<div>
<img src="" alt=""><img src="" alt=""><img src="" alt="">
</div>
img*3
<div>
<img src="" alt="">
<img src="" alt="">
<img src="" alt="">
</div>
img*3
<div>
<img src="" alt=""><img src="" alt=""><img src="" alt="">
</div>