Angularjs API copy Deep copy detailed and example _angularjs

Angular provides a api--copy (source,destination) that can replicate objects, and it performs a deep copy of the source object.

The following points need to be noted when using:

1. If there is only one argument (an object that does not specify a copy), a copy object is returned
2. If destination is specified, a deep copy of the object is copied to destination
3. If source is null or undefined, then the source is returned directly
4. If source is desitination, then the error will be.
   

Let's take a look at the sample using the example:

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