我单选,多选,父节点选,子节点也能选,各种乱七八糟的选
v-model 为选项 path 数组,如[v-1, v-1-1, v-1-1-1]
[v-1, v-1-1, v-1-1-1]
v-model 嵌套数组,如[[v-1, v-1-1, v-1-1-1], [v-1, v-1-1, v-1-1-2]]
[[v-1, v-1-1, v-1-1-1], [v-1, v-1-1, v-1-1-2]]