ie11将html、head、meta、script*2、title、body、div*3一共10个标签认定为元素，文本节点不是元素。
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<script src="jquery.js"></script>
<title>jquery</title>
<script>
$(document).ready(function(){
$('#first').html("first");
$('.second').html("second");
$('div').css('color','red');
alert($('*').length);
//DOM对象->jquery对象
// var adiv=document.getElementsByTagName('div');
// var $div=$(adiv);
// $div.first().css('color','red');
//jquery对象->DOM对象
// $('div')[1].style.color='red';
// $('div').get(1).style.color='red';
});
</script>
</head>
<body>
<div id="first">111</div>
<div class="second">222</div>
<div>333</div>
</body>
</html>
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