大佬帮帮忙，我不想考试挂科牙

<!DOCTYPE html>
<html lang="zh">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
	<style>
		#container {
			width: 900px;
			height: 400px;
		}
		.img {
			width: 300px;
			height: 400px;
			float: left;
		}
		.img > img {
			width: 300px;
			height: 400px;
		}
	</style>
</head>
<body>
	<div class="oprate">
		<button onclick="handleAddImg()">添加图片</button>
		<button onclick="handleRemoveImg()">删除图片</button>
		<button onclick="handleCopyImg()">复制图片</button>
	</div>
	<div id="container">
		<div class="img">
			<img src="./11.jpg" alt="">
		</div>
		<div class="img">
			<img src="./22.jpg" alt="">
		</div>
	</div>
<script>
	function handleAddImg() {
		var childNode = document.createElement('div')
		childNode.className = 'img'
		var imgNode = document.createElement('img')
		imgNode.setAttribute('src', './33.jpg')
		childNode.appendChild(imgNode)
		var container = document.getElementById('container')
		container.appendChild(childNode)
	}
	function handleRemoveImg() {
		var container = document.getElementById('container')
		container.removeChild(document.getElementsByClassName('img')[0])
	}
	function handleCopyImg() {
		var container = document.getElementById('container')
		children = document.getElementsByClassName('img')
		child = children[children.length - 1].cloneNode(true)
		container.appendChild(child)
	}
</script>
</body>
</html>

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