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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>利用document对象的方法</title>
</head>
<body>
<div id="box">box</div>
<div class="bar">bar</div>
<div name="main">main</div>
<script>
document.write(document.getElementById('box')+'<br>');
document.write(document.getElementsByClassName('bar')+'<br>');
document.write(document.getElementsByTagName('div')+'<br>');
document.write(document.getElementsByName('main')+'<br>');
var box=document.getElementById('box');
var divs=document.getElementsByTagName('div');
document.write(divs[0]===box);
</script>
</body>
</html>