为什么我跟你写的差不多一样，但是背景还是在图片上面的？
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<meta name="Generator" content="EditPlus®">
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<title>Document</title>
<style type="text/css">
*{margin:0px;padding:0px}
.a{position:absolute;width:100px;height:200px;background:red;z-index:0px}
img{position:relative;margin-bottom:-100px;z-index:-1}
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<img src="C:\Users\gml\Desktop\新建文件夹\1503472792(1).jpg"/>
<div></div>
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