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<div id = "list">
<section><p><a id = "A" >A</a></p>
<ul>
<li>Irene Anders</li>
</ul></section>
<section><p><a id = "B">B</a></p></section>
<section><p><a id = "C">C</a></p></section>
<section><p><a id = "D">D</a></p></section>
<section><p><a id = "E">E</a></p></section>
<section><p><a id = "F">F</a></p></section>
<section><p><a id = "G">G</a></p></section>
<section><p><a id = "H">H</a></p></section>
<section><p><a id = "I">I</a></p></section>
<section><p><a id = "J">J</a></p></section>
<section><p><a id = "K">K</a></p></section>
<section><p><a id = "L">L</a></p></section>
<section><p><a id = "M">M</a></p></section>
<section><p><a id = "N">N</a></p></section>
<section><p><a id = "O">O</a></p></section>
<section><p><a id = "P">P</a></p></section>
<section><p><a id = "Q">Q</a></p></section>
<section><p><a id = "R">R</a></p></section>
<section><p><a id = "S">S</a></p></section>
<section><p><a id = "T">T</a></p></section>
<section><p><a id = "U">U</a></p></section>
<section><p><a id = "V">V</a></p></section>
<section><p><a id = "W">W</a></p></section>
<section><p><a id = "X">X</a></p></section>
<section><p><a id = "Y">Y</a></p></section>
<section><p><a id = "Z">Z</a></p></section>
</div>
var list = document.getElementById("list");
alert(list);
var list = document.getElementById("list");
list.getElementsByTagName("section")//能获取到所有的section
list.getElementsByTagName("section")[index]//能获取到下标为index的section
var list = document.getElementById("list");
//list.childNodes可以获取到列表
//list.html()获取的是list下面的html
//第一个得到的是整个div(包含div#list自身),第二个得到的才是div里的所有子节点(不包含div#list)。
var div=document.getElementById('list');
var list=div.childNodes;
//用console在控制台里看,不要用alert
console.log(div,list)