Calculate the number of milliseconds difference between two times
SDK apifmDevelopment reference
```javascript
WXAPI.commonDiffMillis(d1, d2)
```
+ d1 date, the format is: 2022-05-08 10:54:18, if not passed, the default is the current time
+ d2 date, the format is: 2022-05-08 10:54:18, if not passed, the default is the current time
```json
{
"code": 0,
"data": 1000,
"msg": "success"
}
```
+ data The number of milliseconds difference between the two times