inject html in jquery code example

Example 1: innerhtml jquery

var itemtoReplaceContentOf = $('#regTitle');
itemtoReplaceContentOf.html('');
newcontent.appendTo(itemtoReplaceContentOf);

Example 2: jquery add

$( "p" ).add( "div" ).addClass( "widget" );
var pdiv = $( "p" ).add( "div" );