javascript - adding data to DOM -

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As far as I have seen, no one has specifically addressed this method due to the document. GetElementsByClassName I am calling, but I can not understand why this will not work. Here's the intent to add the value (string) to the page. I have identified an existing device named after class and just added a text node, after which the data item, "account name:" should be displayed. Obviously there is something wrong with my syntax or argument but I can not see it.

Can someone shed some light on me? 

  this.updateUname = function () {var NewNode [0] = getElementsByClassName ('ACC'); Var div = document.createTextNode ('div'); Div.innerHTML = "Account name:"; NewNode.appendChild (div); }   
 Thanks, Ajfbiz in advance   
 
 
 Change:  
  var newNode [0] = getElementsByClassName ('ACC');   
 to  
  var newNode = document.getElementsByClassName ('ACC') [0];   
 Here's a bella:

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