Function round

round(num, precision?): number
- Round number to precision
- 将数字四舍五入到指定精度
Parameters
- num: number
  
  Number
- Optional precision: number = 0
  
  Precision
Returns number
rounded number
Example
```
round(120.4321)
//=120

round(120.4321, 2)
//=120.43
```
- Defined in src/core/utils.ts:229

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