如何在JavaScript中使用五位长的Unicode字符 [英] How to use five digit long Unicode characters in JavaScript

问题描述

在JavaScript中我可以这样做：

In JavaScript I can do this:

foo = "\u2669" // 1/4 note

但我不能这样做

foo = "\u1D15D" // full note  -five hex digits

它将被解释为\ u1D15后跟D

It will be interpreted as "\u1D15" followed by "D"

这有什么变通方法吗？

更新2012-07-09： ECMAScript Harmony的提案现在包括对所有Unicode字符的支持。

UPDATE 2012-07-09: The proposal for ECMAScript Harmony now includes support for all Unicode characters.

推荐答案

在 fromCharCode的MDN文档，他们注意到javascript只会自然地处理高达0xFFFF的字符。但是，他们还有一个针对fromCharCode的固定方法的实现，可以做你想要的（下面转载）：

In the MDN documentation for fromCharCode, they note that javascript will only naturally handle characters up to 0xFFFF. However, they also have an implementation of a fixed method for fromCharCode that may do what you want (reproduced below):

function fixedFromCharCode (codePt) {
    if (codePt > 0xFFFF) {
        codePt -= 0x10000;
        return String.fromCharCode(0xD800 + (codePt >> 10), 0xDC00 + (codePt & 0x3FF));
    }
    else {
        return String.fromCharCode(codePt);
    }
}

foo = fixedFromCharCode(0x1D15D);

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