width: 20px
height: 20px
border: 2px solid #000
border-top: none
border-right: none
transform:rotate(45deg)
}
就用div加css就能做出这种效果了.给你一个刚写的例子。<div style='background:redheight:20pxwidth:30pxdisplay: inline-block'></div>
<div style='top:5pxheight: 0pxborder: 15px red solidwidth: 20pxborder-top-color: transparentborder-right-color: transparentborder-bottom-color: transparentdisplay: inline-blockposition: relativeleft: -4px'></div>
