设置了border-radius的元素overflow:hidden失效解决方法

父元素设置圆角、overflow:hidden之后，当子元素中设置了transform后，父元素的overflow:hidden在圆角的地方失效了，解决方法：父元素加：position:relative; z-index:1; 就可以了

demo代码如下：

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"/>
<meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0,user-scalable=no" />
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="Cache-Control" content="no-cache">
<meta http-equiv="Expires" content="0">
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="apple-mobile-web-app-status-bar-style" content="black">
<meta name="format-detection" content="telephone=no">
<meta name="apple-mobile-web-app-title" content="">
<title>test</title>
<style>
body{ color:#d00;}
.box , .box2 , .box3{ width:120px; height:120px; margin:10px auto; border-radius:50%; border:#d00 solid 10px; overflow:hidden;}
.box{/* position:relative; z-index:1;*/}
.box2{/* position:relative; z-index:1;*/}
.box3{ position:relative; z-index:1;}

.box img{ width:100%; height:100%;
			-webkit-transform:/*perspective(500px) */rotate(0);
					transform:/*perspective(500px) */rotate(0);
}
.box2 img , .box3 img{ width:100%; height:100%;
			-webkit-transform:perspective(500px) rotate(0);
					transform:perspective(500px) rotate(0);
}
</style>
</head>

<body>
	
    <p style="text-align:center;">overflow:hidden 正常：</p>
    <div class="box">
        <img src="https://avatar.csdn.net/D/5/3/3_qq_16494241.jpg" />
    </div>
    
    <p style="text-align:center;">============================================</p>
    <p style="text-align:center;">overflow:hidden 失效：图片加了 transform:perspective(500px) rotate(0);</p>
    <div class="box2">
        <img src="https://avatar.csdn.net/D/5/3/3_qq_16494241.jpg" />
    </div>
    
    <p style="text-align:center;">============================================</p>
    <p style="text-align:center;">overflow:hidden 正常：overflow:hidden 失效后，父元素加 position:relative; z-index:1;</p>
    <div class="box3">
        <img src="https://avatar.csdn.net/D/5/3/3_qq_16494241.jpg" />
    </div>
    
</body>
</html>

设置了border-radius的元素overflow:hidden失效解决方法

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