在Plotly中，使用HTML，为什么一些希腊字母与十进制一起工作，而与实体名称不一起工作？

Question

在绘图图形标题中，我需要使用希腊字母，对于某些字母，我可以直接使用实体名称，如下所示： μ并呈现正确的希腊字母mu。然而，当我用ω或ψ对欧米茄或psi做同样的操作时，我只会用带有“&；”的拉丁字符来写单词和“；”但不是对应的希腊语。以下是结果的图像：

但是，使用十进制代码可以按预期工作：layout = go.Layout(title='ω #968;')

Answer 1

我认为它与javascript后端有关，特别是在svg_text_utils.js中的entityToUnicode

所以我认为$mu;是唯一有效的希腊字母（因为它是由entityToUnicode和一手其他字符一起处理的）

从svg_text_utils.js：

/*
 * N.B. HTML entities are listed without the leading '&' and trailing ';'
 * https://www.freeformatter.com/html-entities.html
 *
 * FWIW if we wanted to support the full set, it has 2261 entries:
 * https://www.w3.org/TR/html5/entities.json
 * though I notice that some of these are duplicates and/or are missing ";"
 * eg: "&", "&amp", "&", and "&AMP" all map to "&"
 * We no longer need to include numeric entities here, these are now handled
 * by String.fromCodePoint/fromCharCode
 *
 * Anyway the only ones that are really important to allow are the HTML special
 * chars <, >, and &, because these ones can trigger special processing if not
 * replaced by the corresponding entity.
 */
var entityToUnicode = {
    mu: 'μ',
    amp: '&',
    lt: '<',
    gt: '>',
    nbsp: ' ',
    times: '×',
    plusmn: '±',
    deg: '°'
};