如何放置"< / script>"在一个JavaScript字符串？ [英] How to put "</script>" in a javascript string?
问题描述
我一直在尝试javascript中的一些技巧，并且出现了一个荒谬的问题：我无法使用< script> 作为javascript中的子字符串字符串！下面是一个例子：
< html>
< head>
< script>
alert（< script>< / script>）;
< / script>
< / head>
< / html>
它应该打印出 < script>< /
）; $ b脚本> $ b 在页面上打印出来，就像HTML。
问题： 如何使用< script> ，然后是< / script> ; 子字符串，在一个字符串中，在Javascript中，任何为什么这样做？
这是 JSFiddle ）： 你最多的是< / script> .HTML解析器无法识别Javascript字符串或嵌套< script> 标签，所以它将解释为最初的< script> 的结束标签。也就是说，这部分文档被解析为：
< script>（打开标签）
alert（< s cript>（文本节点 - 脚本的内容）
< / script> （关闭标签）
）;（文本节点 - 纯文本）
第二个< / script> 被忽略，因为没有其他< script> 标签关闭。
要解决这个问题，请分解< / script ，以便HTML解析器不会看到它。
alert（< script>< \ / script>）;
或：
alert（< ; script><+/ script>）;
外部Javascript文件，这个问题只出现在内联脚本中。
I've been trying some tricks in javascript and came to a ridiculous problem: I can't use <script> as a substring in a javascript string! Here is an example:
<html>
<head>
<script>
alert("<script></script>");
</script>
</head>
</html>
It supposed to print out <script></script>, but instead, I get this:
");
Printed out on the page, as HTML.
Question: How can I use <script> followed by </script> substrings, in a String, in Javascript, any why is it acting that way?
Here is JSFiddle of it :)
What's tripping you up is the </script>. The HTML parser doesn't recognize Javascript strings or nested <script> tags, so it's interpreting that as the closing tag for the initial <script>. That is, this part of the document is parsed as:
<script> (open tag)
alert("<script> (text node - contents of the script)
</script> (close tag)
"); (text node - plain text)
The second </script> is ignored, as there's no other <script> tag for it to close.
To work around this, break up </script so that the HTML parser doesn't see it. For instance:
alert("<script><\/script>");
or:
alert("<script><" + "/script>");
or just put the code in an external Javascript file. This issue only arises for inline scripts.
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