javascript dom的图片最终版源代码 （重复看）
html代码： <!DOCTYPE html> <html lang="en"> <head> <meta http-equiv="content-type" content="text/html; charset=utf-8" /> <title>Image Gallery</title> <script type="text/javascript" src="scripts/showPic.js"></script> <link rel="stylesheet" href="styles/layout.css" type="text/css" media="screen" /> </head> <body> <h1>Snapshots</h1> <ul id="imagegallery"> <li> <a href="images/fireworks.jpg" title="A fireworks display"> <img src="images/thumbnail_fireworks.jpg" alt="Fireworks" /> </a> </li> <li> <a href="images/coffee.jpg" title="A cup of black coffee" > <img src="images/thumbnail_coffee.jpg" alt="Coffee" /> </a> </li> <li> <a href="images/rose.jpg" title="A red, red rose"> <img src="images/thumbnail_rose.jpg" alt="Rose" /> </a> </li> <li> <a href="images/bigben.jpg" title="The famous clock"> <img src="images/thumbnail_bigben.jpg" alt="Big Ben" /> </a> </li> </ul> </body> </html> css： body { font-family: "Helvetica","Arial",serif; color: #333; background-color: #ccc; margin: 1em 10%; } h1 { color: #333; background-color: transparent; } a { color: #c60; background-color: transparent; font-weight: bold; text-decoration: none; } ul { padding: 0; } li { float: left; padding: 1em; list-style: none; } #imagegallery { list-style: none; } #imagegallery li { display: inline; } #imagegallery li a img { border: 0; } function addLoadEvent(func) { var oldonload = window.onload; if (typeof window.onload != 'function') { window.onload = func; } else { window.onload = function() { oldonload(); func(); } } } function insertAfter(newElement,targetElement) { var parent = targetElement.parentNode; if (parent.lastChild == targetElement) { parent.appendChild(newElement); } else { parent.insertBefore(newElement,targetElement.nextSibling); } } function preparePlaceholder() { if (!document.createElement) return false; if (!document.createTextNode) return false; if (!document.getElementById) return false; if (!document.getElementById("imagegallery")) return false; var placeholder = document.createElement("img"); placeholder.setAttribute("id","placeholder"); placeholder.setAttribute("src","images/placeholder.gif"); placeholder.setAttribute("alt","my image gallery"); var description = document.createElement("p"); description.setAttribute("id","description"); var desctext = document.createTextNode("Choose an image"); description.appendChild(desctext); var gallery = document.getElementById("imagegallery"); insertAfter(placeholder,gallery); insertAfter(description,placeholder); } function prepareGallery() { if (!document.getElementsByTagName) return false; if (!document.getElementById) return false; if (!document.getElementById("imagegallery")) return false; var gallery = document.getElementById("imagegallery"); var links = gallery.getElementsByTagName("a"); for ( var i=0; i < links.length; i++) { links[i].onclick = function() { return showPic(this); } links[i].onkeypress = links[i].onclick; } } function showPic(whichpic) { if (!document.getElementById("placeholder")) return true; var source = whichpic.getAttribute("href"); var placeholder = document.getElementById("placeholder"); placeholder.setAttribute("src",source); if (!document.getElementById("description")) return false; if (whichpic.getAttribute("title")) { var text = whichpic.getAttribute("title"); } else { var text = ""; } var description = document.getElementById("description"); if (description.firstChild.nodeType == 3) { description.firstChild.nodeValue = text; } return false; } addLoadEvent(preparePlaceholder); addLoadEvent(prepareGallery);
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