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<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>使用DOM操控图片</title>
		<style type="text/css">
			html,div,ul,li {margin: 0px;padding: 0px;}
			a{cursor: pointer;}
			li {list-style: none;cursor: pointer;}
			fieldset {border: #000 1px dashed;width: 225px;height: 225px;padding: 10px;text-align: center;float: left;margin-left: 5px;}
			#cont_left {width: 300px;height: 500px;float: left;}
			#cont_right {float: left;}
			.newcss1{background-color: rgb(153, 225, 9);}
		</style>
	</head>
	<body>
		<div id="cont_left">
			<ul><img src="img/fold.gif"><a onclick="show('menu1')"> 通过DOM获取信息 </a>
				<ul id="menu1">
					<li onclick="showImg()"><img src="img/doc.gif">获取原始图片路径</li>
					<li onclick="getFruit()"><img src="img/doc.gif">获取我喜欢的水果</li>
				</ul>
			</ul>

			<ul><img src="img/fold.gif"><a onclick="show('menu2')"> 通过DOM操作元素 </a>
				<ul id="menu2">
					<li onclick="createImg()"><img src="img/doc.gif">创建图片</li>
					<li onclick="cloneImg()"><img src="img/doc.gif">克隆图片</li>
					<li onclick="changeImg()"><img src="img/doc.gif">改变图片</li>
					<li onclick="removeImg()"><img src="img/doc.gif">删除图片</li>
				</ul>
			</ul>

			<ul><img src="img/fold.gif"><a onclick="show('menu3')"> 通过DOM操作样式 </a>
				<ul id="menu3">
					<li onclick="changeCss1()"><img src="img/doc.gif">为原始图片加上行间样式</li>
					<li onclick="changeCss2()"><img src="img/doc.gif">为所有的fieldset加上内部样式</li>
				</ul>
			</ul>

		</div>
		<fieldset>
			<legend>原始图片</legend>
			<img id="fruit" src="img/fruit.jpg">
		</fieldset>
		<fieldset>
			<legend>图片路径</legend>
			<p id="msg1">在这里显示</p>
		</fieldset>
		<fieldset>
			<legend>选择你喜欢的水果</legend>
			<ul style="text-align: left;">
				<li>
					<input name="enjoy" type="checkbox" value="苹果" />苹果
				</li>
				<li>
					<input name="enjoy" type="checkbox" value="香蕉"  />香蕉
				</li>
				<li>
					<input name="enjoy" type="checkbox" value="葡萄" />葡萄
				</li>
				<li>
					<input name="enjoy" type="checkbox" value="梨"  />梨
				</li>
				<li>
					<input name="enjoy" type="checkbox" value="西瓜" />西瓜
				</li>
			</ul>
			<div id="msg2" style="margin-top: 10px;text-align: left;"></div>
		</fieldset>
		<fieldset>
			<legend>创建图片</legend>
			<div id="msg3"></div>
		</fieldset>
		<fieldset>
			<legend>克隆图片</legend>
			<div id="msg4"></div>
		</fieldset>
		<script>
			//菜单收缩与扩展
			function show(title) {
				let currentMenu = document.getElementById(title);
				let currentStatus = currentMenu.style.display;
				currentMenu.style.display = currentStatus == "" ? "none" : "";
			}
			//获取原始图片路径
			function showImg() {
                var img = document.getElementById("fruit");
                var msg = document.getElementById("msg1");
                msg.innerHTML = "图片路径：" + img.src;

			}
			//获取喜欢的水果
			function getFruit() {
                var fruits = document.getElementsByName("enjoy");
                var msg = document.getElementById("msg2");
                var result = "我喜欢的水果有：";
                for (var i = 0; i < fruits.length; i++) {
                    if (fruits[i].checked) {
                        result += fruits[i].value + " ";
                    }
                }
                msg.innerHTML = result;

			}
			//创建图片
			function createImg() {
                var img = document.createElement("img");
                img.src = "img/grape.jpg";
                var msg = document.getElementById("msg3");
                msg.appendChild(img)

			}
			//克隆图片
			function cloneImg() {
				var img = document.getElementById("fruit");
                var clone = img.cloneNode(true);
                var msg = document.getElementById("msg4");
                msg.appendChild(clone);
			}
			//改变图片
			function changeImg() {
				var img = document.getElementById("fruit");
		        img.src = "img/grape.jpg";
			}
			//删除图片
			function removeImg() {
				var img = document.getElementById("fruit");
               // var img = document.getElementById("grape");
                var msg = document.getElementById("msg4");
                msg.removeChild(img);
			}
			//操作样式1 为原始图片加上行间样式，比如加个红色边框
			function changeCss1(){
                var img = document.getElementById("fruit");
		        img.style.border = "1px solid red";

			}
			//操作样式2 为所有的 fieldset 标签加个内部样式，比如加背景色
			function changeCss2(){
				var fieldsets = document.getElementsByTagName("fieldset");
		        for (var i = 0; i < fieldsets.length; i++) {
			    fieldsets[i].style.backgroundColor = "yellow";
            }
			}
		</script>
	</body>
</html>