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想在页面直接加载js文件，js应放在哪里

2011-12-15 22:35 260 查看

看我写的第一个代码

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.6.1/jquery.min.js">
</script>

</head>

<body>

<script>
$('p:nth-child(odd)').css("background","red");
$('p:nth-child(even)').css("background","green");
</script>

<p>we can we can</p>
<p>we can we can</p>
<p>we can we can</p>
<p>we can we can</p>
<p>we can we can</p>
<p>we can we can</p>
<p>we can we can</p>
<p>we can we can</p>

</body>
</html>

始终没有效果，最后把script文件放在body最后，终于可以了。

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.6.1/jquery.min.js">
</script>

</head>

<body>

<p>we can we can</p>
<p>we can we can</p>
<p>we can we can</p>
<p>we can we can</p>
<p>we can we can</p>
<p>we can we can</p>
<p>we can we can</p>
<p>we can we can</p>
<script>
$('p:nth-child(odd)').css("background","red");
$('p:nth-child(even)').css("background","green");
</script>

</body>
</html>

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