假设数据是这样的，不难发现，其中父级roleCode有重复的，子级roleCode也有重复的，如何做到把重复的去掉，同时，又可以把不重复的合并到一起呢？
testTreeData: [
{
roleCode: 'staff',
roleNameCn: '员工',
children: [
{
roleCode: 'staff_01',
roleNameCn: '员工_01',
children: [
{
roleCode: 'staff_01_01',
roleNameCn: '员工_01_01'
}
]
}
]
},
{
roleCode: 'staff',
roleNameCn: '员工',
children: [
{
roleCode: 'staff_02',
roleNameCn: '员工_02',
children: [
{
roleCode: 'staff_02_01',
roleNameCn: '员工_02_01'
},
{
roleCode: 'staff_02_02',
roleNameCn: '员工_02_02'
}
]
}
]
},
{
roleCode: 'staff',
roleNameCn: '员工',
children: [
{
roleCode: 'staff_02',
roleNameCn: '员工_02',
children: [
{
roleCode: 'staff_webank_02_03',
roleNameCn: '员工_02_03'
},
{
roleCode: 'staff_webank_02_04',
roleNameCn: '员工_02_04'
}
]
}
]
},
{
roleCode: 'aaaaaaaa',
roleNameCn: '员工aaa'
},
{
roleCode: 'bbbbbbbb',
roleNameCn: '员工bbb'
}
]`
