JavaScript CEWP with Client Context

This gets the last inserted item in table TestJS which has columns ID, Title, URL.

<a href="javascript:TEST()">Click ME!</a><script type="text/javascript">


function TEST() 
{
// var myQueryString = '<View/>'; 

 var myQueryString = "<View><Query><OrderBy><FieldRef Name='Created' Ascending='False' /></OrderBy></Query><RowLimit>1</RowLimit></View>";
 
 var myContext = new SP.ClientContext.get_current();
 var myWeb = myContext.get_web(); 
 var myList = myWeb.get_lists().getByTitle('TestJS'); 
 var myQuery = new SP.CamlQuery();  
 myQuery.set_viewXml(myQueryString); 
 myItems = myList.getItems(myQuery); 

 myContext.load(myItems,'Include(ID, Title, URL)'); 

 myContext.executeQueryAsync(Function.createDelegate(this, TestSuccess), null); 

}

function TestSuccess(sender,args)
{
 var county = myItems.get_count(); 
 
 var tEnumerator = myItems.getEnumerator(); 


 var tDetails = '';

 var currentEnum;
  while(tEnumerator.moveNext())
  {
   currentEnum = tEnumerator.get_current(); 
   tDetails = tDetails + ' ' + currentEnum.get_item('Title')
  + ' ' + currentEnum.get_item('URL'); 
   
  }


alert("Query Result: " + tDetails);

alert("Last value: " + currentEnum.get_item('URL'));

}</script>