用css樣式實現，八邊形圖片有邊框並邊框和圖片有間距的，請多多指教
css部分
.pictrue{
box-sizing: border-box;
position: relative;
width: 400px;
height: 400px;
transform: rotate(45deg);
overflow: hidden;
}
.pictrue .item{
box-sizing: border-box;
padding: 10px;
position: absolute;
width: 100%;
height: 100%;
content:" ";
transform: rotate(-45deg);
border: 1px solid red;
overflow: hidden;
background-color: #fff;
}
.pictrue .item:after{
position: absolute;
top: -1px;
left: -1px;
content:" ";
width: 100%;
height: 100%;
transform: rotate(135deg);
border: 1px solid red;
}
.pictrue .item:before{
position: absolute;
left: 0;
top: 0;
box-sizing: border-box;
content:" ";
width: 100%;
height: 100%;
transform: rotate(135deg);
border: 10px solid #fff;
}
.pictrue .item img{
max-width: 100%;
}
html部分
<div class="pictrue">
<div class="item">
<img src="01.jpg">
</div>
</div>
效果圖
01.jpg
