Element为el-tree添加指示虚线_element ui tree 虚线指示线

<div class='tree-container'>
	<el-tree class="tree" :indent='0' ></el-tree>
</div>
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.tree-container {
  overflow: hidden;
}
.tree /deep/ .el-tree-node {
  position: relative;
  padding-left: 0 ;
}

.tree /deep/ .el-tree-node__children {
  padding-left: 16px;
}

.tree /deep/ .el-tree-node :last-child:before {
  height: 12px;
}

.tree /deep/ .el-tree > .el-tree-node:before {
  border-left: none;
}

.tree-container /deep/ .el-tree > .el-tree-node:after {
  border-top: none;
}

.tree /deep/ .el-tree-node:before {
  content: '';
  left: -4px;
  position: absolute;
  right: auto;
  border-width: 1px;
  border-left: 1px dashed #4386c6;
  bottom: 0px;
  height: 100%;
  top: 0px;
  width: 1px;
}

.tree /deep/ .el-tree-node:after {
  content: '';
  left: -4px;
  position: absolute;
  right: auto;
  border-width: 1px;
  border-top: 1px dashed #4386c6;
  height: 20px;
  top:12px;
  width: 10px ;
}
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效果图：