<div id="one">the one</div>
<div id="two"><p>the two</p></div>
<div id="three"><p>the three</p></div>
<script type="text/javascript">
alert($("div").filter(":not(:first):not(:last)").html()); //out put<p>the two</p>
alert($("div").filter(function() { return this.id == "two"; }).html());//output <p>the two</p> as well
</script>
<div id="one">the one</div>
<div id="two"><p>the two</p><p></p><p></p></div>
<div id="three"><p>the three</p></div>
<script type="text/javascript">
alert($("div").find("p").text()); //alert "the twothe three"
alert($("div").find("p").length); //alert 4 instead of original 3
</script>
<div id="wrapper">
<div id="two">
<p id="p1">
the two</p>
</div>
</div>
<script type="text/javascript">
alert($("#p1").parents("div").length); //alert 2 include <div id="two"> and <div id="wrapper">
alert($("#p1").closest("div").length); //alert 1 and only include <div id="two">
alert($("#p1").parents("p").length); //alert 0 because it does not include current element
alert($("#p1").closest("p").length); //alert 1 because it contain itself <p id="p1">
</script>
<div id="wrapper">
text node here
<div id="two">
<p id="p1">
the two</p>
</div>
</div>
<script type="text/javascript">
alert($("#wrapper").children().length);//alert 1 because only direct children included
alert($("#wrapper").find("*").length); //alert 2 because all desendants included
alert($("#wrapper").find(">*").length);//alert 1 because only direct children included
</script>
<div id="wrapper">
text node here
<div id="two">
<p id="p1">
the two</p>
</div>
</div>
<script type="text/javascript">
alert($("#wrapper").find(">*").end().get(0).id);//alert "wrapper" instead of "two" because of end() method has been used
</script>
<div id="wrapper">
text node here
<div id="two">
<p id="p1">
the two</p>
</div>
</div>
<script type="text/javascript">
alert($("#wrapper").find("#p1").html("new value").end().get(0).id);//alert wrapper because end method
alert($("#p1").text())//alert new value bacause the html method in previous has not been cancelled
</script>
<div id="wrapper">
text node here
<div id="two">
<p id="p1">
the two</p>
</div>
</div>
<script type="text/javascript">
var $a = $("#wrapper").find("#two").andSelf();
alert($a[0].id);//alert two first
alert($a[1].id);//alert wrapper after that
</script>
