使用JavaScript检测单个Unicode字符支持 [英] Detecting individual Unicode character support with JavaScript

问题描述

是否可以检测客户端是否支持特定的Unicode字符，或者是否将其显示为缺少的字形框？

Is it possible to detect if the client supports a particular Unicode character or if it will be rendered as a missing glyph box?

重要提示：支持多种浏览器尽可能

Important: Support in as many browsers as possible

不重要：效率，速度或优雅

Not important: Efficiency, speed, or elegance

我能想到的唯一方法是使用画布，所以我想我会在开始走这条路之前问。

The only method I can think of trying is using a canvas, so I figured I'd ask before I start going down that road.

谢谢！

编辑：这不是打算在公共网站上使用;我只是试图编译每个浏览器支持的字符列表。

This is not intended for use on a public web site; I am just trying to compile a list of characters supported by each browser.

推荐答案

这是一个比真实的答案：

This is more of a wild idea than a real answer:

如果你能找到一个你知道的字符总是作为一个缺少的字形框来显示，你可以使用与这个 javascript字体检测器 - 在屏幕外渲染字符和缺少的字形，并比较其宽度。如果他们不同，那么你知道字符不是作为一个丢失的字形框呈现。当然，这对固定宽度的字体根本不起作用，并且对于其他字体来说，它可能有很多固定的负值，其中许多字符的宽度相同。

If you could find a character which you knew would always render as a missing glyph box, you could use the same technique as this javascript font detector--render the character and the missing glyph box offscreen and compare their widths. If they're different, then you know the character is not rendering as a missing glyph box. Of course, this won't work at all for fixed-width fonts, and it could have a lot of fixed negatives for other fonts where a lot of the characters are the same width.

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