# default

## 作用

设置当被检测值为`undefined | null | NaN`时，`validate`和`validateSilent`方法的返回值。

若开启严格模式***(strict=true)***, 则设置被检测值为`undefined | null | NaN | '' | {} | []`时的默认返回值。

## 参数

* `value` ***(\*)***  - *`validate`*和*`valdiateSilent`*默认值，可为任意类型。当`value`为函数时，则设置函数的返回值为默认值，函数参数为被检测值原始值——`undefined`, `null`, `NaN`, `''`, `{}`或`[]`.
* `[strict]` ***(boolean)*** - 是否为严格模式，默认为`false`不开启。若明确设置`strict=true`则开启严格模式。
* `[ctx]` ***(\*)*** - 当`value`为函数时的执行上下文`this`。

## 示例

```javascript
const schema1 = racoon.any().default(1);
schema1.validate(undefined); // pass, 返回 1
schema1.validate(null); // pass, 返回 1
schema1.validate(NaN); // pass, 返回 1

const schema2 = racoon.any().default(1, true);
schema2.validate(undefined); // pass, 返回 1
schema2.validate(null); // pass, 返回 1
schema2.validate(NaN); // pass, 返回 1
schema2.validate(''); // pass, 返回 1
schema2.validate({}); // pass, 返回 1
schema2.validate([]); // pass, 返回 1
```


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