//更改箭头位置
.el-tree-node__content > .el-tree-node__expand-icon {position: absolute;right: 12px;
}

//更改箭头图片
.el-tree-node__expand-icon {transform: rotate(-90deg);
}
.el-tree-node__expand-icon.expanded {transform: rotate(0deg);
}
// 有子节点 且已展开
.el-tree .el-tree-node__expand-icon.expanded.el-icon-caret-right:before {background: url('~@/assets/images/arrow.png') no-repeat 0 3px;content: '';display: block;width: 12px;height: 12px;font-size: 12px;background-size: 12px;
}
// 有子节点 且未展开
.el-tree .el-icon-caret-right:before {background: url('~@/assets/images/arrow.png') no-repeat 0 3px;content: '';display: block;width: 12px;height: 12px;font-size: 12px;background-size: 12px;
}
// 没有子节点
.el-tree .el-tree-node__expand-icon.is-leaf::before {background: #fff;content: '';display: block;width: 0px;height: 0px;font-size: 0px;background-size: 0px;
}