手写经过li时加一层+

1.

2..tab-ul li{

padding-left:32px;

width:78px;

height:34px;

line-height:34px;

margin-bottom:10px;

color:white;

font-size:14px;

position:relative;

overflow:hidden;

cursor:pointer;

.addIcon{

display:none;

position:absolute;

left:0;

bottom:0;

width:100%;

height:100%;

background-color:rgba(0,0,0,.5);

&::after,&::before{

content:'';

position:absolute;

left:50%;

top:50%;

width:15px;

height:3px;

background-color:#fff;

transform:translate(-50%, -50%);

-webkit-transform:translate(-50%, -50%);

}

&::before{

height:15px;

width:3px;

}

}

&:hover .addIcon{

display:block;

}

&.li1{

background:url("../images/icon1.png")no-repeat 10px center #00C88F;

}

&.li2{

}

&.li3{

}

&.li4{

}

}

3.