HTML文档中“< charset =” B”>的含义 [英] Meaning of `<meta charset="B">` in an HTML document

问题描述

我现在正在学习HTML，与编码有关的一个方面使我感到困惑。

想象一下，我打开测试编辑器，编写一些HTML代码，并使用字符集 A 将其保存（例如UTF-8或ANSI或其他名称） ）。然后，在我看来，会发生以下情况：

1. 我键入的所有字符都映射到某些数字，该映射由charset A ;




2. 数字以二进制形式表示为 0 s和 1 s。

在我刚刚保存的HTML文档中，有一行< meta charset = B> 其中， B 是与 A 不同的另一个字符集。

当我尝试使用浏览器打开HTML文档时会发生什么？它会根据字符集 B 将构成我的文档的 0 和 1 的序列映射到错误的字符（不是我指的是

如您所见，我试图理解的真实含义。 HTML文档中的meta charset = B> 。

解决方案

是的，完全正确地理解了。这正是 mojibake 的诞生方式；某些人试图使用错误的字符集来解释二进制序列，这可能导致显示意外/错误的字符，或者文档无法完整解码，这时的具体行为取决于尝试进行解码的应用程序。 / p>

<元字符集> 元素（实际上主要是 Content-Type HTTP标头）是建议，可通知客户端（浏览器）应使用哪种字符集来解释文档。否则，客户不知道。如果服务器/文档建议使用错误的字符集，则结果将在某种程度上被破坏。

I am learning HTML now, and one aspect related to the encoding confuses me.

Imagine, I open my test editor, write some HTML code and save it using charset A (e.g. UTF-8 or ANSI or something else). Then in my view the following happens:

1. all characters I have typed are mapped to certain numbers, the mapping is specified by the charset A;

2. the numbers are saved in the computer memory in their binary representation as sequences of 0 s and 1 s.

In the HTML document I have just saved there is a line <meta charset="B"> where B is another charset different from A.

What now happens when I attempt to open the HTML document with a browser? Will it map according to charset B the sequences of 0 s and 1 s which comprise my document to wrong characters (not the ones I meant when I wrote the document) and thus will display some rubbish?

As you see with this question I am trying to understand the real meaning of <meta charset="B"> in an HTML document.

解决方案

Yes, exactly, you have understood correctly. This is precisely how mojibake is being born; something is trying to interpret a binary sequence using the wrong character set, which either leads to unintended/wrong characters being displayed, or the document failing to decode entire, at which point the concrete behaviour depends on the application trying to do the decoding.

The <meta charset> element (and really primarily the Content-Type HTTP header) are advisory, informing the client (browser) in what character set it should interpret the document. Otherwise the client cannot know. If the server/document are advising the wrong charset, the result will be broken to some degree or another.

这篇关于HTML文档中“< charset =” B”>的含义的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！