js document

<html><head lang="en">

    <meta charset="UTF-8">

    <title></title>

</head>

<body>

<p></p>

<img src="img/img_01.jpg">

<a href="#">百度一下</a>

<p></p>

<script>

  console.log(document.all);

</script>

</body></html>

打印结果：

HTMLAllCollection[]: html1: head2: meta3: title4: body5: p6: img7: a8: p9: scriptlength: 10__proto__: HTMLAllCollection

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