HTMLCollection，NodeLists和对象数组之间的区别
在DOM方面，我一直对HTMLCollections，对象和数组感到困惑。例如...
document.getElementsByTagName("td")和之间有什么区别$("td")？
$("#myTable")并且$("td")是对象（jQuery对象）。为什么console.log还会在它们旁边显示DOM元素数组，它们不是对象而不是数组？
什么是难以捉摸的“NodeLists”，我如何选择一个？
还请提供以下脚本的任何解释。
谢谢
[123,"abc",321,"cba"]=[123,"abc",321,"cba"]
{123:123,abc:"abc",321:321,cba:"cba"}=Object { 123=123, abc="abc", 321=321, more...}
Node= Node { ELEMENT_NODE=1, ATTRIBUTE_NODE=2, TEXT_NODE=3, more...}
document.links= HTMLCollection[a #, a #]
document.getElementById("myTable")= <table id="myTable">
document.getElementsByClassName("myRow")= HTMLCollection[tr.myRow, tr.myRow]
document.getElementsByTagName("td")= HTMLCollection[td, td, td, td]
$("#myTable")= Object[table#myTable]
$("td")= Object[td, td, td, td]
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="content-type" content="text/html; charset=ISO-8859-1" />
<title>Collections?</title>
<script src="http://code.jquery.com/jquery-latest.js" type="text/javascript"></script>
<script type="text/javascript">
$(function(){
console.log('[123,"abc",321,"cba"]=',[123,"abc",321,"cba"]);
console.log('{123:123,abc:"abc",321:321,cba:"cba"}=',{123:123,abc:"abc",321:321,cba:"cba"});
console.log('Node=',Node);
console.log('document.links=',document.links);
console.log('document.getElementById("myTable")=',document.getElementById("myTable"));
console.log('document.getElementsByClassName("myRow")=',document.getElementsByClassName("myRow"))
console.log('document.getElementsByTagName("td")=',document.getElementsByTagName("td"));
console.log('$("#myTable")=',$("#myTable"));
console.log('$("td")=',$("td"));
});
</script>
</head>
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