下面是一个代表性的代码的一部分。令我困惑的是：在这种情况下，参数“container”的等效DOM节点是什么？有很多元素，它如何考虑<img>元素是container.children？
<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<body>
<div id="slideshow">
<img src="https://www.kasandbox.org/programming-images/animals/birds_rainbow-lorakeets.png" alt="Rainbow lorakeets" />
<img src="https://www.kasandbox.org/programming-images/animals/butterfly.png"alt="Butterfly" />
<img src="https://www.kasandbox.org/programming-images/animals/cat.png" alt="Cat" />
<img src="https://www.kasandbox.org/programming-images/animals/crocodiles.png" alt="Crocodiles" />
<img src="https://www.kasandbox.org/programming-images/animals/fox.png" alt="Fox" />
</div>
<script>
var slideShow = function(container) {
this.images = [];
this.curImage = 0;
for (i = 0; i < container.childElementCount; i++) {
this.images.push(container.children[i]);
this.images[i].style.display = "none";
}
container是你打电话给new slideShow()时传递的任何元素。在你的情况下，它应该是：
var ss = new slideShow(document.getElementById('slideshow'));
然后container.children是直接嵌套在DIV中的元素，它们都是<img>元素。