<title>New Web Project</title>
<script type="text/javascript">
var paras = document.getElementsByTagName("p");
for (var i=0; i< paras.length; i++) {
var title_text = paras[i].getAttribute("title");
if (title_text != null) {
alert(title_text);
}
}
</script>
</head>
<body>
<h1>New Web Project Page</h1>
<p title="test"> This is just a test</p>
</body>
为什么警报没有价值?我觉得它应该弹出文本test
。