jquery - how does the first part of this work? -

I have this snippet and I want to know how it works .... I understand keypup, But I do not understand this data ... what it is doing and

are the parts that I do not understand

  $ ('p span '). Each (function () {$ (this) .data ('factor', $ (this) .text ());})    and  
  $ ('P span') .each (function () {$ (this) .text (function () {return $ (this) .data ('factor') * factor;});})    Looks like they are looping but   
 
  jQuery function data In the first block, in the first block, you are looping through spans, and each one adds a piece of data called 'Factors', and the text of the data period is in the second block, each of youPan stories are original "factor" value set the value of the saved time for a  Factor  variable.   

 


  







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jquery - how does the first part of this work? -

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