【js 编程艺术】小制作二

时间：2022-10-28 12:53:54

首先是一个html文档

/* explanation.html */
<!DOCTYPE html>

<html>

 <head>

     <meta charset="utf-8">

     <title>Explaining the Doucment Object Model</title>

     <link rel="stylesheet" type="text/css" href="styles/typography.css">　　　　//注意href所指向的文件

 </head>

 <body>

    <ul id="navigation">

         <li><a href="index.html" accesskey="1">Home</a></li>

         <li><a href="search.html" accesskey="4">Search</a></li>

         <li><a href="contact.html" accesskey="9">Contact</a></li>

    </ul>

     <h1>What is the Document Object Model ?</h1>

     <p>

         The <abbr title="World Wide Web Consortium">W3C</abbr> defines the <abbr title="Document Object Model">DOM</abbr> as:

     </p>

     <blockquote cite="http://www.w3.org/DOM">

        <p>

            A platform- and language-neutral interface that will allow programs and scripts to dynamically access and update the content, structure an style of documents.

        </p>

     </blockquote>

     <p>

         It's an <abbr title="Application Programming interface">API</abbr> that can be used to navegate <abbr title="HyperText <arkup Language">HTML</abbr> and <abbr title="eXtensible Markup Language">XML</abbr> doucments.

     </p>

     <script type="text/javascript" src="scripts/displayAbbreviations.js"></script>　　//注意href所指向的文件
 </body> </html>

注意我的 link 标签和 script 标签所引用的文件夹的位置。然后就是css

/* typography.css*/

body{

    font-family: "Hevetica", "Arial", sans-serif;

    font-size:10pt;

}

abbr{

    text-decoration: none;

    border:;

    font-style: normal;

}

最后就是精髓之所在js文件了：

/* displayAbbreviations.js */
function addLoadEvent(func) {

    var oldonload = window.onload;

    if(typeof window.onload != "function"){

        window.onload = func;

    }else{

        window.onload = function(){

            oldonload();

            func();

        }

    }

}

function dispalyAbbreviations() {

    //检查兼容性

    if(!document.getElementsByTagName) return false;

    if(!document.createElement) return false;

    if(!document.createTextNode) return false;

    //取得所有缩略词

    var dlist = document.createElement("dl");

    var abbreviations = document.getElementsByTagName("abbr");

    if (abbreviations.length < 1) return false;

    var defs = new Array();

    //遍历缩略词

    for (var i = 0; i < abbreviations.length; i++) {

        var current_abbr = abbreviations[i];

        //ie6及更早不支持abbr元素,但是添加if语句不显示

        // if(current_abbr.chileNodes.length < 1) continue;

        var definition = current_abbr.getAttribute("title");

        var key = current_abbr.lastChild.nodeValue;

        defs[key] = definition;

    }

    //创建定义列表

    var dlist = document.createElement("dl");

    //遍历定义

    for(key in defs){

        var definition = defs[key];

        //创建定义标题

        var dtitle =  document.createElement("dt");

        var dtitle_text = document.createTextNode(key);

        dtitle.appendChild(dtitle_text);

        //创建定义描述

        var ddesc = document.createElement("dd");

        var ddesc_text = document.createTextNode(definition);

        ddesc.appendChild(ddesc_text);

        //将定义标题和定义描述添加到定义列表里

        dlist.appendChild(dtitle);

        dlist.appendChild(ddesc);

    }

    // if(dlist.chileNodes.length < 1) return false;

    //创建标题

    var header = document.createElement("h2");

    var header_text = document.createTextNode("Abbreviations");

    header.appendChild(header_text);

    //把标题添加到页面主体

    document.body.appendChild(header);

    document.body.appendChild(dlist);

}

function displayCitations(){

    //检查兼容性

    if(!document.getElementsByTagName) return false;

    if(!document.createElement) return false;

    if(!document.createTextNode) return false;

    //取得所有引用

    var quotes = document.getElementsByTagName("blockquote");

    //遍历所有引用

    for(var i = 0; i < quotes.length; i++){

        if(!quotes[i].getAttribute("cite")) continue;

        var url = quotes[i].getAttribute("cite");

        var quoteChildren = quotes[i].getElementsByTagName("*");

        if(quoteChildren.length < 1) continue;

        var elem = quoteChildren[quoteChildren.length - 1];

        //创建标记

        var link = document.createElement("a");

        var link_text = document.createTextNode("source");

        link.appendChild(link_text);

        link.setAttribute("href", url);

        var superscript = document.createElement("sup");

        superscript.appendChild(link);

        //把标记添加到引用中的最后一个元素节点

        elem.appendChild(superscript);

    }

}

function displayAccessKeys(){

    //检查兼容性

    if(!document.getElementsByTagName) return false;

    if(!document.createElement) return false;

    if(!document.createTextNode) return false;

    var links = document.getElementsByTagName("a");

    var akeys = new Array();

    //遍历数组

    for(var i = 0; i < links.length; i++){

        var current_link = links[i];

        if(!current_link.getAttribute("accesskey")) continue;

        var key = current_link.getAttribute("accesskey");

        var text = current_link.lastChild.nodeValue;

        akeys[key] = text;

    }

    //创建列表

    var list = document.createElement("ul");

    for(key in akeys){

        var text = akeys[key];

        var str = key + ": " + text;

        var item = document.createElement("li");

        var item_text = document.createTextNode(str);

        item.appendChild(item_text);

        list.appendChild(item);

    }

    //创建标题

    var header = document.createElement("h3");

    var header_text = document.createTextNode("Accesskeys");

    header.appendChild(header_text);

    document.body.appendChild(list);

}

addLoadEvent(dispalyAbbreviations);

addLoadEvent(displayCitations);

addLoadEvent(displayAccessKeys);

显示出来就是这样子的：

【js 编程艺术】小制作二



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就这么多了。
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