纵向多维分组

在基本使用说明中，纵向分组只有一个地区，实际可以添加多列作为纵向分组

实际的数据效果：

json数据集数据：

{
  "data": [{
		"region": "华东", "sales": 1000, "gifts": 100, "month": "1月", "province": "安徽", "city": "合肥"
	},{
		"region": "华东", "sales": 1000, "gifts": 100, "month": "1月", "province": "安徽", "city": "安庆"
	},{
		"region": "华东", "sales": 1000, "gifts": 100, "month": "2月", "province": "安徽", "city": "安庆"
	},{
		"region": "华东", "sales": 1000, "gifts": 100, "month": "2月", "province": "安徽", "city": "合肥"
	},{
		"region": "华北", "sales": 1000, "gifts": 100, "month": "1月", "province": "河北", "city": "邯郸"
	},{
		"region": "华北", "sales": 1000, "gifts": 100, "month": "2月", "province": "河北", "city": "邯郸"
	},{
		"region": "华南", "sales": 2000, "gifts": 200, "month": "2月", "province": "广东", "city": "广州"
	},{
		"region": "华南", "sales": 3000, "gifts": 300, "month": "1月", "province": "广东", "city": "广州"
	},{
		"region": "华南", "sales": 5000, "gifts": 600, "month": "1月", "province": "广东", "city": "深圳"
	},{
		"region": "华南", "sales": 6000, "gifts": 600, "month": "2月", "province": "广东", "city": "深圳"
	},{
		"region": "华北", "sales": 7000, "gifts": 600, "month": "2月", "province": "河北", "city": "唐山"
	},{
		"region": "华北", "sales": 7000, "gifts": 600, "month": "1月", "province": "河北", "city": "唐山"
	},{
		"region": "华南", "sales": 2000, "gifts": 200, "month": "2月", "province": "广西", "city": "南宁"
	},{
		"region": "华南", "sales": 3000, "gifts": 300, "month": "1月", "province": "广西", "city": "南宁"
	},{
		"region": "华南", "sales": 5000, "gifts": 600, "month": "1月", "province": "广西", "city": "桂林"
	},{
		"region": "华南", "sales": 6000, "gifts": 600, "month": "2月", "province": "广西", "city": "桂林"
	}]
}