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【js 编程艺术】小制作二

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: 0;
    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：

就这么多了。

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原文地址：https://www.cnblogs.com/libra-yong/p/6308596.html