JavaScript学习系列3 案例研究: JavaScript图片库
<!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=utf-8" />
<title>无标题文档</title>
</head>
<body>
<h1>Snapshots</h1>
<ul>
<li>
<a href="images/Chrysanthemum.jpg" onclick="showPic(this); return false;" title="A Chrysanthemum display">Chrysanthemum</a>
</li>
<li>
<a href="images/Desert.jpg" onclick="showPic(this); return false;" title="A Desert display">Desert</a>
</li>
<li>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
</head>
<body>
<h1>Snapshots</h1>
<ul>
<li>
<a href="images/Chrysanthemum.jpg" onclick="showPic(this); return false;" title="A Chrysanthemum display">Chrysanthemum</a>
</li>
<li>
<a href="images/Desert.jpg" onclick="showPic(this); return false;" title="A Desert display">Desert</a>
</li>
<li>
<!-- 点击的时候调用showPic(this)方法，这里this为当前节点、return false: 说明这个链接没有被点击 -->
<a href="images/Hydrangeas.jpg" onclick="showPic(this); return false;" title="A Hydrangeas display">Hydrangeas</a>
</li>
</ul>
<script src="file.js"></script>
</body>
</html>
<a href="images/Hydrangeas.jpg" onclick="showPic(this); return false;" title="A Hydrangeas display">Hydrangeas</a>
</li>
<!-- 在下方显示图片 -->
<img id="placeholder" src="" alt="my image gallery" />
<img id="placeholder" src="" alt="my image gallery" />
<!-- 通过id更改字体 -->
<p id="description">Choose an image.</p></ul>
<script src="file.js"></script>
</body>
</html>
JavaScript
function showPic(whichpic) {
var source = whichpic.getAttribute("href");
var placeholder = document.getElementById("placeholder");
placeholder.setAttribute("src", source);
var text = whichpic.getAttribute("title");
var description = document.getElementById("description");
description.firstChild.nodeValue = text;
}
var source = whichpic.getAttribute("href");
var placeholder = document.getElementById("placeholder");
placeholder.setAttribute("src", source);
var text = whichpic.getAttribute("title");
var description = document.getElementById("description");
description.firstChild.nodeValue = text;
}
- childNodes: 获取子节点的数组
- nodeType: 节点类型
-
- 元素节点: 1
- 属性节点: 2
- 文本节点: 3
- nodeValue: 节点的值
- firstChild: 第一个子节点
- lastChild: 最后一个子节点
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