Function round

round(number, d): number
四舍五入 const toFixed = (n, fixed) => ~~(Math.pow(10, fixed) * n) / Math.pow(10, fixed); const toPrecision = (number, c) => (Math.round(+number * 10 ** c) / 10 ** c).toFixed(c);
Parameters
- number: any
  浮点数
- d: number
  保留小数位
Returns number
Example
```
round(1.2345, 2); /// 1.23
round(0.355, 2); /// 0.36
round(1.005, 2); /// 1.01
```