為什么結(jié)果不對啊
<!DOCTYPE?HTML>
<html>
<head>
<meta?http-equiv="Content-Type"?content="text/html;?charset=utf-8">
<title>無標(biāo)題文檔</title>
</head>
<body>
??<p?id="intro">我的課程</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>以下為li列表title的值,當(dāng)title為空時，新設(shè)置值為"WEB前端技術(shù)":</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=="")
????{
????List[i].setAttribute("title","WEB前端技術(shù)");
????document.write(List[i].getAttribute("title"));
????}
????
??}
</script>
</body>
</html>結(jié)果只顯示了JS JQ是為什么
2016-01-16
?List[i].setAttribute("title","WEB前端技術(shù)");
????document.write(List[i].getAttribute("title"));
Lists[i]少個字母
2016-03-03
Lists，少了個s