Deep cloning an object in JavaScript means creating a new object that is an independent copy of the original object, including all nested objects and arrays. There are several approaches to deep cloning an object in JavaScript. Here are three common methods: 1. Using `JSON.parse()` and `JSON.stringify()`: 

const originalObject = {
    name:'test name',
	addr:{
	  city:'test city',
	  state:'test state'
	}
  }
const clonedObject = JSON.parse(JSON.stringify(originalObject)); // will returned clone of given object
This method works by converting the original object to a JSON string using `JSON.stringify()`, and then parsing the JSON string back into a new object using `JSON.parse()`. This creates a deep copy of the original object, but it has limitations. It will discard any function properties, undefined properties, or properties with circular references. 2. Using a recursive function: 

function deepClone(obj) {
  if (typeof obj !== 'object' || obj === null) {
    return obj;
  }
  
  const clonedObj = Array.isArray(obj) ? [] : {};
  
  for (let key in obj) {
    if (obj.hasOwnProperty(key)) {
      clonedObj[key] = deepClone(obj[key]);
    }
  }
  
  return clonedObj;
}

const originalObject = {
    name:'test name',
	addr:{
	  city:'test city',
	  state:'test state'
	}
  }
const clonedObject = deepClone(originalObject); // will returned clone of given object

let arr=[1,2,3,[4,5 ,[6,7]]];
const clonedArray = deepClone(arr); // will returned clone of given Array
This method involves creating a recursive function `deepClone()` that traverses the object and creates a deep copy by recursively cloning nested objects and arrays. It handles circular references and functions properly. However, be cautious when using this method with very large or deeply nested objects, as it can impact performance. Keep in mind that deep cloning an object can have performance implications, especially for large or complex objects. Choose the method that suits your needs, taking into account performance considerations and the specific requirements of your use case.