试一试 - CSS Reference border-image-repeat

<!DOCTYPE html>
<html>
<head>
<style> 
#borderimg1 { 
 border: 15px solid transparent;
 padding: 15px;
 border-image-source: url(border.png);
 border-image-repeat: repeat;
 border-image-slice: 30;
}

#borderimg2 { 
    border: 15px solid transparent;
    padding: 15px;
    border-image-source: url(border.png);
    border-image-repeat: round;
    border-image-slice: 30;
}

#borderimg3 { 
 border: 15px solid transparent;
 padding: 15px;
 border-image-source: url(border.png);
 border-image-repeat: stretch; 
 border-image-slice: 30;
}
</style>
</head>
<body>

The border-image-repeat property specifies whether the border image should be repeated, rounded or stretched:
border-image-repeat: repeat;
border-image-repeat: round;
border-image-repeat: stretched;

Here is the original image:<img src="border.png">
Note: Internet Explorer 10, and earlier versions, do not support the border-image-repeat property.

</body>
</html>