'javascript：'前缀何时有效？ [英] When is the 'javascript:' prefix valid syntax?

问题描述

我知道您可以对< a> 标记中的网址使用javascript：pseudo协议。但是，我注意到Firefox和IE都允许' javascript：'在< script> 标签。这是有效的语法吗？它是否会改变范围规则？

I know that you can use a javascript: pseudo protocol for URLs in an <a> tag. However, I've noticed that Firefox and IE will both allow 'javascript:' to precede javascript code within a <script> tag. Is this valid syntax? Does it change the scoping rules?

示例：
我已经多次看到过：

Examples: I've seen this many times:

<a onclick="javascript:alert('hello world!');">Hello World!</a>

但这是合法/有效的语法并且它做了什么特别的事情：

But is this legal/valid syntax and does it do anything special:

<script type="text/javascript">
javascript:alert('hello world!');
</script>

推荐答案

href之外属性（它是协议说明符）， name ：只创建标签（例如可以使用继续或中断）。

Outside of the href attribute (where it is a protocol specifier), name: just creates a label (such as one might use with a continue or break).

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