Function singletonProxy

singletonProxy<T extends object>(
obj: new (...args: any[]) => T,
): new (...args: any[]) => T
传入一个对象，利用Proxy包装返回一个单例对象因为使用了Proxy，所以this绑定还是原来的对象不会受影响
Type Parameters
- T extends object
Parameters
- obj: new (...args: any[]) => T
Returns new (...args: any[]) => T
Example
```
	const singleDate = singletonProxy(Date)
   const date1 = new singleDate()
   const date2 = new singleDate()
	date1 === date2
```
- Defined in src/modules/proxy.ts:15