1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
2 <html xmlns="http://www.w3.org/1999/xhtml">
3 <head>
4 <meta http-equiv="Content-Type" content="text/html;charset=UTF-8" />
5 <title>test03</title>
6 </head>
7 <body>
8 <input type="button" id="myBtn" value="点击" />
9 <script type="text/javascript" src="test03.js"></script>
10 </body>
11 </html>
1 document.body.onclick = function(event) {
2 console.log(event.currentTarget === document.body);//true
3 console.log(this === document.body);//true
4 console.log(event.target === document.getElementById("myBtn"));//true
5 };
