HTML：

<el-tree :data="treedata" :default-expand-all="isExpandAll" :indent="50" :check-strictly="false" show-checkbox  node-key="id" :key="Math.random()" ref="tree" highlight-current :props="defaultProps">
</el-tree>

提交：

console.log("保存树权限数组：","  勾选项的数组  ",this.$refs.tree.getCheckedKeys(),' 带半勾选项的数组 ',this.$refs.tree.getHalfCheckedNodes().concat(this.$refs.tree.getCheckedNodes()))

回显设置：

for(var i in this.treecheck){
     this.$refs.tree.setChecked(this.treecheck[i],true,false);//通过setChecked()方法回显
}