<!DOCTYPE HTML><html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><title>无标题文档</title></head><body> <p id="intro">我的课程</p> <ul> <li title="JS">JavaScript</li> <li title="JQ">JQuery</li> <li title="">HTML/CSS</li> <li title="JAVA">JAVA</li> <li title="">PHP</li> </ul> <h1>以下为li列表title的值,当title为空时，新设置值为"WEB前端技术":</h1><script type="text/javascript"> var Lists=document.getElementsByTagName("li"); for (var i=0; i<Lists.length;i++) { var text= Lists[i].getAttribute("title") document.write(text +"<br>"); if(text=="") { Lists[i].setAttribute("title","前端技术"); document.write(Lists[i].getAttribute("title")+"<br>"); } }</script></body></html>
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