我正在使用函数String.fromCharCode(decimal value),并将一个十进制值传递给它。

它的英文字符工作正常,但是当我尝试对日语字符进行解码时,它给了我一些仲裁字符。

谁能告诉我String.fromCharCode(decimal value)是否支持扩展字符。

最佳答案

不,它不支持使用两个替代字符的字符。 MDC具有用于处理此问题的实用程序功能:

// String.fromCharCode() alone cannot get the character at such a high code point
// The following, on the other hand, can return a 4-byte character as well as the
//   usual 2-byte ones (i.e., it can return a single character which actually has
//   a string length of 2 instead of 1!)
alert(fixedFromCharCode(0x2F804)); // or 194564 in decimal

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

09-16 12:37