javascript - Uncaught TypeError: Cannot read property 'getElementsByTagName' of null -


I'm trying this but .getElementsByTagName () is used, an error Generated: 

  var tag = document.body.getElementsByTagName ("*"); Uncaught TypeError: Why is this error producing, and how can I fix it?  
 
 
    "post-text" itemprop = "text"> 
  document body  Will not be assigned unless the body element is created.  
   and   element  & lt; Script & gt;  element  element (because you are trying to get all the elements, you want to be in the  end  of the body element) or it can be kept in a function and it is such a Call from the event that sets fire after the body build (such as  window   load  events).   

 






























    





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