index.js
function(doc, first, last) { 
							var f = doc.WordPos[first];
							var l;
							if (last==doc.WordPos.length-1) //
								l = doc.DocLength;
							else
								l = doc.WordPos[last+1]; 
							return l-f; 
						}
function(doc, first, last) { 
							var f = doc.WordPos[first];
							var l;
							if (last==doc.WordPos.length-1) //
								l = doc.DocLength;
							else
								l = doc.WordPos[last+1]; 
							return l-f; 
						}
function ( doc , first , last ) { var f = doc . WordPos [ first ] ; var l ; if ( last == doc . WordPos . length - 1 ) // l = doc . DocLength ; else l = doc . WordPos [ last + 1 ] ; return l - f ; }
increment anchor count
increment anchor count