这里总共有四种面包屑效果，其中第一种运用:before和:after，运用border生成同等大小的尖角，叠加起来左右错动1px；第二个还是运用:before和:after，运用border生成不同的尖角，一个在左一个在右；第三个是运用一个:after生成一个正方形，设置border-radius然后rotate旋转45度；第四个直接运用水平扭曲就skewX就可以了。

css主要代码：

/*demo1*/

#breadcrumbs-one{

background: #eee;

border-width: 1px;

border-style: solid;

border-color: #f5f5f5 #e5e5e5 #ccc;

border-radius: 5px;

box-shadow: 0 0 2px rgba(0,0,0,.2);

overflow: hidden;

width: 100%;

}

#breadcrumbs-one li{

float: left;

}

#breadcrumbs-one a{

padding: .7em 1em .7em 2em;

float: left;

text-decoration: none;

color: #444;

position: relative;

text-shadow: 0 1px 0 rgba(255,255,255,.5);

background-color: #ddd;

background-image: linear-gradient(to right, #f5f5f5, #ddd);

}

#breadcrumbs-one li:first-child a{

padding-left: 1em;

border-radius: 5px 0 0 5px;

}

#breadcrumbs-one a:hover{

background: #fff;

}

#breadcrumbs-one a::after,

#breadcrumbs-one a::before{

content: "";

position: absolute;

top: 50%;

margin-top: -1.5em;

border-top: 1.5em solid transparent;

border-bottom: 1.5em solid transparent;

border-left: 1em solid;

right: -1em;

}

#breadcrumbs-one a::after{

z-index: 2;

border-left-color: #ddd;

}

#breadcrumbs-one a::before{

border-left-color: #ccc;

right: -1.1em;

z-index: 1;

}

#breadcrumbs-one a:hover::after{

border-left-color: #fff;

}

#breadcrumbs-one .current,

#breadcrumbs-one .current:hover{

font-weight: bold;

background: none;

}

#breadcrumbs-one .current::after,

#breadcrumbs-one .current::before{

content: normal;

}

/*demo2*/

#breadcrumbs-two{

overflow: hidden;

width: 100%;

}

#breadcrumbs-two li{

float: left;

margin: 0 .5em 0 1em;

}

#breadcrumbs-two a{

background: #ddd;

padding: .7em 1em;

float: left;

text-decoration: none;

color: #444;

text-shadow: 0 1px 0 rgba(255,255,255,.5);

position: relative;

}

#breadcrumbs-two a:hover{

background: #99db76;

}

#breadcrumbs-two a::before{

content: "";

position: absolute;

top: 50%;

margin-top: -1.5em;

border-width: 1.5em 0 1.5em 1em;

border-style: solid;

border-color: #ddd #ddd #ddd transparent;

left: -1em;

}

#breadcrumbs-two a:hover::before{

border-color: #99db76 #99db76 #99db76 transparent;

}

#breadcrumbs-two a::after{

content: "";

position: absolute;

top: 50%;

margin-top: -1.5em;

border-top: 1.5em solid transparent;

border-bottom: 1.5em solid transparent;

border-left: 1em solid #ddd;

right: -1em;

}

#breadcrumbs-two a:hover::after{

border-left-color: #99db76;

}

#breadcrumbs-two .current,

#breadcrumbs-two .current:hover{

font-weight: bold;

background: none;

}

#breadcrumbs-two .current::after,

#breadcrumbs-two .current::before{

content: normal;

}

/*demo3*/

#breadcrumbs-three{

overflow: hidden;

width: 100%;

}

#breadcrumbs-three li{

float: left;

margin: 0 2em 0 0;

}

#breadcrumbs-three a{

padding: .7em 1em .7em 2em;

float: left;

text-decoration: none;

color: #444;

background: #ddd;

position: relative;

z-index: 1;

text-shadow: 0 1px 0 rgba(255,255,255,.5);

border-radius: .4em 0 0 .4em;

}

#breadcrumbs-three a:hover{

background: #abe0ef;

}

#breadcrumbs-three a::after{

background: #ddd;

content: "";

height: 2.5em;

margin-top: -1.25em;

position: absolute;

right: -1em;

top: 50%;

width: 2.5em;

z-index: -1;

transform: rotate(45deg);

border-radius: .4em;

}

#breadcrumbs-three a:hover::after{

background: #abe0ef;

}

#breadcrumbs-three .current,

#breadcrumbs-three .current:hover{

font-weight: bold;

background: none;

}

#breadcrumbs-three .current::after{

content: normal;

}