DateFiled 日期组建

```html
<DateFiled
        v-model="nowDate" :required="true" label="时间"
        @onSelect="select"/>
          
          
  data () {
    return {
        nowDate: '2020-12-25',
      }
    }
```
|字段名称 |字段说明 |类型 |必填 |默认 |
| ----|------|-------|------|------|
|value|当前值|String|Y|-|
|format|格式化类型|String|N|YYYY-MM-DD|
|minYear|最小年份|String|N|1800|
|maxYear|最大年份|String|N|2500|
|disabled|是否禁用|Boolean|N|false|
|label|字端名称|String|Y|-|
|required|必输|Boolean|N|false|
|proportion|字端明与字端占比|Array|N|[1,2]|
|itemHeight|字端默认高度|Number|N|45|
|hasBorder|是否有下边框|Boolean|N|true|
|showIcon|右边下拉箭头|Boolean|N|true|
|rightIcon|自定义下拉箭头|String|N|-|
|@onSelect|下拉框选中函数|Function|N|-|

