javascript - What are the pros and cons of calling jQuery functionality via these 2 different methods? -

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I'm trying to understand the difference between these 2 methods of javascript / jQuery functions (if any) I am / P>

Method 1, in document.ready () : 

  $ ('body'). ('Click', 'a.popup', pop up);   
 then  
  function popup () {$ (this) // do something}   
 Method 2, In  document.ready () :  
  popup (); Then click  
  function popup () {$ ("a.popup") (function (e) {// do something here}) ; }   
 All advice appreciated.   
 
 
 The  popup  function in method 2 is called only once, otherwise you are equal Functions  onclick  often attach, what you probably do not want is the  popup  function body directly in  document.ready () . .  
 There is no big advantage in writing, the advantage of method 1 is that if you want to attach the same function to different events and / or with different elements such as  onclick  ,  onmousemove  etc. In this way you will not have to type the body of the function twice.  
 In short, I do not get the benefit in method 2, while I look at method 1.

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