<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>DOM</title>
<script type="text/javascript">
function init(){
var oner=document.getElementById("one"); //找到<li id="one">的元素
oner.style.fontWeight="bold"; //将文本加粗
var lis=document.getElementsByTagName("li"); //找到所有li元素
lis[3].style.color="red"; //将第四个li元素的字体颜色设置为红色
}
</script>
</head>
<body onload="init()">
<ul>
<li id="one">标题一</li>
<li id="two">标题二</li>
<li id="three">标题三</li>
<li id="four">标题四</li>
</ul>
</body>
</html>