(1)代码
<div style="margin:0 auto; border:2px dashed blue; overflow:auto;width: 800px;height: 500px;" >
<img src="images/airPre1.png" alt="图像正在努力加载中.." style="display: block;margin:0 auto;border:2px dashed blue;"/>
</div>
(2)效果
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