js放的位置不对,获取的数据也是不一样的~~~

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>无标题文档</title>
</head>
<body>
<p id="con">javascript</p>
<script type="text/javascript">
var mycar= document.getElementById("con");
document.write("结果是:"+mycar);
</script>
</body>
</html>
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>无标题文档</title>
<script type="text/javascript">
var mycar= document.getElementById("con");
document.write("结果是:"+mycar);
</script>
</head>
<body>
<p id="con">javascript</p>
</body>
</html>各位大神帮忙解释下是什么愿意呢~~~谢谢哦~~~