问题描述
我只是好奇,如果我像这样编写 <script>
标签,为什么我的 JavaScript 无法运行(在 Firefox 和 IE 中测试):
I just curious why my JavaScript can't run (tested in Firefox and IE) if I write the <script>
tag like this:
<script type="text/javascript" src="script.js"/>
如果我将该行更改为:
<script type="text/javascript" src="script.js"></script>
所以我的问题是:为什么我不能关闭开始标签中的 script
标签,因为我里面没有任何内容.
So my question is: why I can't close the script
tag in the start tag since I don't have any content inside it.
我的 JavaScript 代码很简单,只是:
My JavaScript code is simple, just:
alert("test");
注意:我检查了firefox错误控制台,没有错误.
Notes: I check firefox error console and no error.
推荐答案
自闭标签的概念是一个XML概念.您不能在 HTML 中使用它们.(您可以在 XHTML 中使用它们,但前提是文档以 XML 内容类型提供,不能t 如果它被用作 text/html
).
The concept of self-closing tags is an XML concept. You can't use them in HTML. (You can use them in XHTML, but only if the document is served with an XML content-type, not if it is served as text/html
).
在 HTML 中某些元素(例如 <img>
)不能有任何内容,因此它们没有结束标签).
In HTML some elements (such as <img>
) cannot have any content, so they don't have end tags).
由于脚本可以具有 src
属性或者脚本可以在元素内部,因此 <script>
不是其中之一.
Since a script can have a src
attribute or the script be can inside the element, <script>
is not one of them.
(HTML 5 允许 /
字符出现在定义为 EMPTY 的元素的开始标记的末尾,但对于沉迷于 XML 的人来说,这只是糖,在语言).
(HTML 5 allows a /
character to appear at the end of a start tag for an element that is defined as EMPTY, but it is just sugar for people addicted to XML and has no meaning in the language).
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