JavaScript Dom_3 Get element node

How do I get node elements?

The code is as follows:

<%@ page language= "java"  import= "java.util.*"  pageencoding= "GB2312"%><%string  path = request.getcontextpath (); String basepath = request.getscheme () + "://" +request.getservername () + ":" +request.getserverport () +path+ "/";%><! doctype html public  "-//w3c//dtd html 4.01 transitional//en" >

Description
<script type= "text/javascript" >window.onload = function () {var bjname = document.getElementById ("BJ"); Alert ( Bjname) var Bjid = document.getelementsbyname ("Beijing"); alert (bjid.length); var list = document.getElementsByTagName ("Li"); alert (list.length);} </script>
document.getElementById ("ID"): is a method for the entire document, which ensures that the ID is unique when using this method.
Document.getelementbyname ("Property name"): This method is used for attributes that are not defined by the element itself, such as Li without name, so use ByName (). However, IE does not support this method and should be used with caution.
<script type= "text/javascript" >window.onload = function () {var citynode = document.getElementById ("city"); var List = Citynode.getelementbytagname ("li"); alert (list.length);} </script>
Document.getelementbytagname ("TagName"): Gets all the elements that are labeled TagName, and all TagName elements are found throughout the document.

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JavaScript Dom_3 Get element node