javascript

How do jquery and javascript assign the contents of one element to another


<span style="font-size:24px;">
</span>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title> Headless document </title>
</head>
<script src="jquery-1.9.0.min.js"></script>
<script>
$(document).ready(function(){
a=$("#p1")[0].innerText;
$("#p2")[0].innerHTML=a;

})
</script>
<script>
window.onload=function(){
a=document.getElementById("p1").innerText;
document.getElementById("p2").innerHTML=a;

}
</script>
<body>
<p id="p1" name=" This is the title right now "> This is the title right now </p>
<p id="p2" name=" This is a title, "> This is a title, </p>
</body>
</html>