element-ui tree全部展开和全部收起功能的实现

element-ui tree全部展开和全部收起功能的实现
https://blog.csdn.net/m0_59850490/article/details/122366340

element-ui tree实现点击全部展开,只要有二级菜单的都自动展开 ,点击全部收起的时候所有的二级菜单全部收起

for(var i=0;i<this.$refs.selectTree.store._getAllNodes().length;i++){
this.$refs.selectTree.store._getAllNodes()[i].expanded = false;
}