源代码：
HTML教程 - CSS5.NET教程
www.css5.net
返回当前：
http://www.css5.net/javascript.aspx?id=1806
点击运行
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>CSS5.NET教程(css5.net)</title> </head> <body> <h12>JavaScript HTML DOM!</h2> <p>Hello World!</p> <p>Hello Runoob!</p> <p id="demon"></p> <script> var myNodelist = document.querySelectorAll("p"); document.getElementById("demon").innerHTML = "这文档包含 " + myNodelist.length + " 个行段落。"; </script> </body> </html>
运行成功
下面已运行成功：