# allowString

## 作用

允许被检测值为数值的字符串表现形式。

> **说明**
>
> 符合正则表达式`/^[+-]?\d.?\d$/`的字符串即为数值的字符串形式，比如 '123', '-123', '.123', '0.123'.

## 可用版本

\>=1.3.0

## 参数

无

## 示例

```javascript
const schema1 = racoon.number();
schema.validate('123'); // fail

const schema2 = racoon.number().allowString();
schema.validate('123'); // pass, 返回数值 123
schema.validate('.123'); // pass, 返回数值 0.123
schema.validate('-123'); // pass, 返回数值 -123
schema.validate('+123'); // pass, 返回数值 123
```


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