使用 JavaScript 和 HTML 打印表情符号
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Printing emojis with JavaScript and HTML
提问by Tom S?derlund
Why does this work:
为什么这样做：
<p id="emoji">😄</p>
And this doesn't:
而这不会：
document.getElementById("emoji").innerHTML = String.fromCharCode(parseInt('1f604', 16));
回答by bobince
A 'char' in JS terms is actually a UTF-16 code unit, not a full Unicode character. (This sad state of affairs stems from ancient times when there wasn't a difference*.) To use a character outside of the Basic Multilingual Plane you have to write it in the UTF-16-encoded form of a surrogate pair of two 16-bit code units:
JS 术语中的“char”实际上是一个 UTF-16 代码单元，而不是完整的 Unicode 字符。（这种可悲的事态起源于没有区别的古代*。）要使用基本多语言平面之外的字符，您必须以 UTF-16 编码形式编写两个 16的代理对-位代码单元：
String.fromCharCode(0xD83D, 0xDE04)
In ECMAScript 6 we will get some interfaces that let us deal with strings as if they were full Unicode code points, though they are incomplete and are only a fa?ade over the String type which is still stored as a code unit sequence. Then we'll be able to do:
在 ECMAScript 6 中，我们将获得一些接口，让我们可以像处理完整的 Unicode 代码点一样处理字符串，尽管它们是不完整的，并且只是对仍作为代码单元序列存储的 String 类型的一种伪装。然后我们将能够做到：
String.fromCodePoint(0x1F604)
See this questionfor some polyfill code to let you use this feature in today's browsers.
请参阅此问题以获取一些 polyfill 代码，以便您在当今的浏览器中使用此功能。
(*: When I get access to a time machine I'm leaving Hitler alone and going back to invent UTF-8 earlier. UTF-16 must never have been!)
（*：当我使用时间机器时，我将让希特勒一个人呆着，回到更早的时候发明 UTF-8。UTF-16 绝对不是！）
回答by Thomas P.
You can also use the hacky method if you don't want to include String.fromCodePoint()in your code. It consists in creating a virtual element ...
如果您不想包含String.fromCodePoint()在代码中，也可以使用 hacky 方法。它包括创建一个虚拟元素......
elem=document.createElement('p')
elem=document.createElement('p')
... Filling it with the Working HTML...
... 用工作 HTML 填充它...
elem.innerHTML = "😄"
elem.innerHTML = "😄"
... And finally getting its value
... 最终得到它的价值
value = elem.innerHTML
value = elem.innerHTML
To make it short, this works because of the fact that, as soon as you set the value of a HTML container, the value gets converted into the corresponding character.
简而言之，这是因为一旦您设置了 HTML 容器的值，该值就会被转换为相应的字符。
Hope I could help.
希望我能帮上忙。
