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<title>Untitled Document</title>
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<script type="text/javascript">
window.onload=function(){
var ul=document.getElementsByTagName('ul')[0];
//console.log(ul.nodeName);//UL
var lis=ul.childNodes;
for (var i = 0; i < lis.length; i++) {
console.log('the '+i+'th node is '+lis[i].nodeName);
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//the 0th node is #text
// the 1th node is LI
// the 2th node is #text
// the 3th node is LI
// the 4th node is #text
// the 5th node is LI
// the 6th node is #text
ul=document.getElementsByTagName('ul')[1];
lis=ul.childNodes;
for (var i = 0; i < lis.length; i++) {
console.log('the '+i+'th node is '+lis[i].nodeName);
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// the 0th node is LI
// the 1th node is LI
// the 2th node is LI
//很明显 回车也会被认为是一个Node
//所以应该这么处理
ul=document.getElementsByTagName('ul')[0];
lis=ul.childNodes;
for (var i = 0; i < lis.length; i++) {
if(lis[i].nodeType==1){
console.log('the '+i+'th node is '+lis[i].nodeName);
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// the 1th node is LI
// the 3th node is LI
// the 5th node is LI }
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<body>
<ul>
<li>li1</li>
<li>li2</li>
<li>li3</li>
</ul> <ul><li>li1</li><li>li2</li><li>li3</li></ul> </body>
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