缩略语列表函数
HTML 结构：
<!DOCTYPE HTML> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>显示缩略语列表</title> <style> body{ font-family: "Helvetiva", "Arial", sans-serif; font-size: 10pt;} abbr{ border: 0; font-style: normal;} </style> </head> <body> <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 and style of documents.</p></blockquote><p> IT is an <abbr title="Application Programming Interface">API</abbr> that can be used to navigate <abbr title="HyperText Markup Language">HTML </abbr>and <abbr title="eXtensible Markup Language">XML </abbr> documents.</p> <script src="scripts/addLoadEvent.js"></script> <script src="scripts/displayAbbrevitions.js"></script> </body> </html>
js：
function addLoadEvent(func){ var oldonload = window.onload; if (typeof window.onload != 'function') { window.onload = func; } else{ window.onload = function(){ oldonload(); func(); } } } // displayAbbreviations.js function displayAbbreviations(){ // 取得所有缩略词 var abbreviations = document.getElementsByTagName("abbr"); if(abbreviations.length < 1) return false; var defs = new Array(); // 遍历所有缩略词 for( var i=0; i<abbreviations.length; i++){ var current_abbr = abbreviations[i]; 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); // 这里多了一个引号 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); // 把它们添加到定义列表 dlist.appendChild(dtitle); dlist.appendChild(ddesc); } // 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); // 把定义列表添加到页面主体 document.body.appendChild(dlist); } addLoadEvent(displayAbbreviations);
这里面提到了一个for in 语句，其功能是用来枚举对象的属性；
语法：for (property in expression) statement
例子：for (var propName in window){
document.write(propName);
}