Is CDATA really necessary?

2019-06-18 04:10发布

站内问答 / JavaScript
1780 2 6

I use inline Javascript quite a bit, usually in WordPress themes that I make. I had not heard of wrapping inline Javascript in //<![CDATA[ ... //]]> up until a few months ago, and I have been doing this stuff at a fair level of competency for a few years.

I googled around and I hear that people use this because their Javascript doesn't validate otherwise. I use a strict 1.0 xHTML doctype and have never had a problem validating my markup. Is it because I use jquery, or because usually I only have a few lines of code to activate a plugin? Or is the w3 validator being lenient in this regard? Is there any evidence of functional impact when not using these CDATA markings?

2条回答
不美不萌又怎样
2楼-- · 2019-06-18 04:50

Today it's only really required if you want your XHTML document to be valid. e.g. something as simple as this is invalid because of the <p> tags in the javascript with the CDATA it validates

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xml:lang="en" xmlns="http://www.w3.org/1999/xhtml" lang="en">
<head>
  <meta http-equiv="content-type" content="text/html; charset=UTF-8"/>
  <title>foo</title>
  <script type="text/javascript">
    alert("<p>Hallo</p>");
  </script>
</head>
<body>
</body>
</html>
查看更多
0人赞 添加讨论(0) 举报
The star\"
3楼-- · 2019-06-18 04:53

I think you are meant to use it to conform to XHTML Strict. otherwise the JavaScript would not be valid XML.

查看更多
0人赞 添加讨论(0) 举报
登录 后发表回答
相关问题
查看全部
相关文章
查看全部
收藏的人(6)