Content Hinding
All content of html
HTML
<input type="button" value="first click" id="first" />
<input type="button" value="second click" id="second" />
<input type="button" value="show all" id="third" />
JavaScript
$('#first').on('click', function(){
$(this).hide();
});
$('#second').on('click', function(){
$(this).hide();
});
$('#third').on('click', function(){
$('#first, #second').show();
});