elment-ui树形控件添加图标

/deep/ .is-leaf{
  background: transparent !important;
  width: 5px;
  height: 5px;
  background-size: 100%;
  margin-right: 5px;
}
/deep/ .el-tree-node__expand-icon{
  background: url(../../../../assets/shu_ic_wzk.png) no-repeat;
  width: 5px;
  height: 5px;
  background-size: 100%;
  margin-right: 5px;
}
/deep/ .expanded{
  background: url(../../../../assets/shu_ic_zk.png) no-repeat;
  width: 5px;
  height: 5px;
  background-size: 100%;
  margin-right: 5px;
  transform: rotate(0deg) !important;
}
/deep/ .el-icon-caret-right:before{
  content: '';
}