5.dom概述

 1 <!DOCTYPE html>
 2 <html>
 3 <head lang="en">
 4     <meta charset="UTF-8">
 5     <title></title>
 6 </head>
 7 <body>
 8     <div id="box"></div>
 9     <!--<div id="box"></div>-->
10 
11 <script>
12 
13 
14     console.log(document);
15 
16     console.log(document.getElementById("box"));
17     console.log(document.getElementsByClassName("aaa"));
18 
19 </script>
20 </body>
21 </html>
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