jQuery

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
<script>
$(document).ready(function(){
  $("p").click(function(){
    $(this).hide();
  });
});
</script>
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$(this).hide() - hides the current element.
$("p").hide() - hides all <p> elements.
$(".test").hide() - hides all elements with class="test".
$("#test").hide() - hides the element with id="test".
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Syntax  Description     Example
$("*")  Selects all elements    Try it
$(this)     Selects the current HTML element    Try it
$("p.intro")    Selects all <p> elements with class="intro"     Try it
$("p:first")    Selects the first <p> element   Try it
$("ul li:first")    Selects the first <li> element of the first <ul>    Try it
$("ul li:first-child")  Selects the first <li> element of every <ul>    Try it
$("[href]")     Selects all elements with an href attribute     Try it
$("a[target='_blank']")     Selects all <a> elements with a target attribute value equal to "_blank"    Try it
$("a[target!='_blank']")    Selects all <a> elements with a target attribute value NOT equal to "_blank"    Try it
$(":button")    Selects all <button> elements and <input> elements of type="button"     Try it
$("tr:even")    Selects all even <tr> elements  Try it
$("tr:odd")     Selects all odd <tr> elements   Try it