### 历史行情
~~~
get_history_data(code, type = 'd',count = 320)
~~~
#### 参数说明：
* code: 股票代码，上海sh开头，深圳sz开头，例如：sh600000
* type: 行情类型，默认日线数据：
* d: 日线数据
* w: 周线数据
* m: 月线数据
* m5：五分钟线数据
* m30：30分钟线数据
* m60：60分钟线数据
* count: 获取的数据大小，默认320组数据
#### 返回说明：
返回Promise。
**resolve参数对象属性：**
* date:数组，数据日期，
* open:数组，开盘价，
* high:数组，最高价，
* low:数组，最低价，
* close:数组，收盘价，
* volume:数组，成交量,
* raw:数组，原始横向排列数据。
#### 例子
~~~
let stock = require('okaystock')
stock.get_history_data('sh600000','w',10)
.then((data) => {
console.log(data)
})
.catch(err => {
console.log(err)
})
~~~
返回结果：
~~~
{ date:[ '2018-03-23','2018-03-30','2018-04-04','2018-04-13', '2018-04-20','2018-04-27', '2018-05-04','2018-05-11', '2018-05-18','2018-05-23' ],
open: [ 12.31, 11.71, 11.68, 11.53, 11.8, 11.56, 11.33, 10.82, 10.97, 10.98 ],
high: [ 11.71, 11.65, 11.53, 11.69, 11.61, 11.61, 10.83, 10.95, 10.9, 10.85 ],
low: [ 11.64, 11.45, 11.53, 11.49, 11.54, 11.53, 10.8, 10.76, 10.81, 10.82 ],
close: [ 12.4, 11.77, 11.82, 12.02, 11.89, 11.78, 11.33, 11.01, 11.05, 10.98 ],
volume:[ 1415013,1430497, 656605,1096881, 1104157,989534, 1262441,1127779,1110837,497569 ],
raw:[ [ '2018-03-23', '12.310', '11.710', '12.400', '11.640','1415013.000' ],
[ '2018-03-30','11.710','11.650', '11.770','11.450','1430497.000' ],
[ '2018-04-04','11.680', '11.530','11.820','11.530', '656605.000' ],
[ '2018-04-13', '11.530', '11.690','12.020', '11.490', '1096881.000' ],
[ '2018-04-20', '11.800', '11.610','11.890','11.540', '1104157.000' ],
[ '2018-04-27','11.560','11.610', '11.780','11.530', '989534.000' ],
[ '2018-05-04', '11.330','10.830','11.330', '10.800','1262441.000' ],
[ '2018-05-11','10.820','10.950', '11.010','10.760','1127779.000' ],
[ '2018-05-18', '10.970','10.900','11.050', '10.810','1110837.000' ],
[ '2018-05-23', '10.980', '10.85', '10.980', '10.82', '497569' ] ] }
~~~
