Function deepClone

deepClone(data, hash?): any
深拷贝
Parameters
- data: any
  源数据
- hash: WeakMap<object, any> = ...
  hash 存储，避免循环引用。
Returns any
Link
https://juejin.cn/post/7075351322014253064
Example
```
deepClone({a: 1, b: {c: 2}}); /// 新的 {a: 1, b: {c: 2}}
```