javascript - jQuery attr() method to create a data dash attribute -

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I am trying to understand why attribute for adding data-attributes (let's say an image) Name is required in quote I know that it needs to be done, but if a student asked me why I would not have the correct answer then take two examples below.

1.) I am exploring an explanation why dash is a problem.
2.) Is there a way to avoid it, so you do not need to put it in quotation marks? / P>

This does not work: 

  $ ("img"). Attr ({alt: "picture of my cat", data -item: "pet", data-color: "orange",});   
  This works   
  $ ("img"). Attr ({alt: "photo of my cat", 'data-object': "pet", 'data-color': "orange",});   
 3) The argument passed to the ARR () method is the true meaning of an object? 
 4. Is this object just a rule in the literal syntax which is not allowed to have a dash?   
 
 
 1). In object literals, the  -  symbol is not allowed as an identifier because it has zero operator in JavaScript.  
 2.) No, you have to use quotes.  
 3.) Yes.  
 4.) Yes, see 1.

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