javascript HTML 元素 id 的合法字符是什么？
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What are legal characters for an HTML element id?
提问by Tony the Pony
What characters can I use in an identifier for an HTML element?
我可以在 HTML 元素的标识符中使用哪些字符？
For example:
例如：
<SPAN id="section[5]" ...>
<SPAN id="section[5]" ...>
(Or rather, should I stick to certain characters to make sure the idworks across all major browsers/JavaScript engine).
（或者更确切地说，我应该坚持使用某些字符以确保id在所有主要浏览器/JavaScript 引擎上都能正常工作）。
采纳答案by Tim Down
In HTML5, the only restrictions are that the ID must be unique within the document, contain at least one character and contain no spaces. See http://www.w3.org/TR/2014/REC-html5-20141028/dom.html#the-id-attribute
在 HTML5 中，唯一的限制是 ID 在文档中必须是唯一的，至少包含一个字符并且不包含空格。见http://www.w3.org/TR/2014/REC-html5-20141028/dom.html#the-id-attribute
As other answers have pointed out, HTML 4 is more restrictive and specifies that
正如其他答案所指出的那样，HTML 4 的限制性更强，并指定
ID and NAME tokens must begin with a letter ([A-Za-z]) and may be followed by any number of letters, digits ([0-9]), hyphens ("-"), underscores ("_"), colons (":"), and periods (".").
ID 和 NAME 标记必须以字母 ([A-Za-z]) 开头，后面可以跟任意数量的字母、数字 ([0-9])、连字符 ("-")、下划线 ("_") 、冒号 (":") 和句点 (".")。
回答by wajiw
In HTML 4, the idattribute holds a NAME tokenwhich are defined:
在HTML 4中，id属性持有NAME令牌被定义：
ID and NAME tokens must begin with a letter ([A-Za-z]) and may be followed by any number of letters, digits ([0-9]), hyphens ("-"), underscores ("_"), colons (":"), and periods (".").
ID 和 NAME 标记必须以字母 ([A-Za-z]) 开头，后面可以跟任意数量的字母、数字 ([0-9])、连字符 ("-")、下划线 ("_") 、冒号 (":") 和句点 (".")。
As pointed out in a previous post, depending on your implementation you may have troubles with colons and periods along with others: What are valid values for the id attribute in HTML?
正如在前一篇文章中所指出的，根据您的实现，您可能会遇到冒号和句点以及其他问题：HTML 中 id 属性的有效值是什么？
回答by AndreKR
From http://www.w3.org/TR/html4/types.html:
从http://www.w3.org/TR/html4/types.html：
ID and NAME tokens must begin with a letter ([A-Za-z]) and may be followed by any number of letters, digits ([0-9]), hyphens ("-"), underscores ("_"), colons (":"), and periods (".").
ID 和 NAME 标记必须以字母 ([A-Za-z]) 开头，后面可以跟任意数量的字母、数字 ([0-9])、连字符 ("-")、下划线 ("_") 、冒号 (":") 和句点 (".")。
回答by ajreal
All the above answers + IDmust be unique
以上所有答案+ ID必须是唯一的
回答by asthasr
From the HTML4 specification:
从HTML4 规范：
ID and NAME tokens must begin with a letter ([A-Za-z]) and may be followed by any number of letters, digits ([0-9]), hyphens ("-"), underscores ("_"), colons (":"), and periods (".").
ID 和 NAME 标记必须以字母 ([A-Za-z]) 开头，后面可以跟任意数量的字母、数字 ([0-9])、连字符 ("-")、下划线 ("_") 、冒号 (":") 和句点 (".")。
回答by Gabriele Pala
actually I can successfully use a ° too for example
实际上我也可以成功地使用°例如
< span id= "test°" />
< span id="test°" />
Seems to be allowed, and I have no problem with jQuery or other ways to fetch dom elements via the selectors. Perhaps other chars work, but I didn't test them all.
似乎是允许的，我对 jQuery 或其他通过选择器获取 dom 元素的方法没有任何问题。也许其他字符有效，但我没有全部测试。
