Why do you need to use this.property=property in objects?

Why do you need to use this.property=property in objects?

References

Reference NO 1

http://stackoverflow.com/questions/15202504/why-do-you-need-to-use-this-property-property-in-objects

Reference NO 2

http://stackoverflow.com/questions/10105824/when-do-you-use-object-defineproperty

Reference NO 3

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Working_with_Objects

Reference NO 4

http://eloquentjavascript.net/chapter8.html

Reference NO 5

http://developer.apple.com/library/ios/documentation/cocoa/conceptual/ProgrammingWithObjectiveC/EncapsulatingData/EncapsulatingData.html

Reference NO 6

https://www.inkling.com/read/javascript-definitive-guide-david-flanagan-6th/chapter-6/creating-objects

Reference NO 7

http://www.howtocreate.co.uk/tutorials/javascript/objects

Reference NO 8

http://yehudakatz.com/2011/08/12/understanding-prototypes-in-javascript/