how to change html content using class in jquery code example

Example 1: jqueryreplace content of div

$('#content-container').html(linkText);

Example 2: innerhtml jquery

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

Example 3: how to put html inside jquery text

$('div.demo-container').html('<p>All new content. <em>You bet!</em></p>');