如何在GM_xmlhttpRequest中正确处理EUC-JP编码以显示日文?

Question

一个编码EUC-JP的网站使用GM_xmlhttpRequest请求后，使用encoding.min.js转码后结果不能正常显示

直接请求结果显示乱码，请求结果转码为EUC-JP显示乱码，请求二进制结果，转化为EUC-JP编码，以及再转化为UTF8均显示乱码，如何将结果正常显示日文文字

⚠️#NSFW#

function convertBufferToEucJp(buffer) {
        // Convert buffer to Uint8Array
        const uint8Array = new Uint8Array(buffer);

        // Convert Uint8Array to string with UTF-8 encoding (assuming the buffer is UTF-8)
        const utf8String = new TextDecoder("utf-8").decode(uint8Array);

        // Convert UTF-8 string to EUC-JP
        const eucJpString = Encoding.convert(utf8String, {
            to: 'EUCJP',
            from: 'UTF8'
        });

        return eucJpString;
    }

    GM_xmlhttpRequest({
        method: "GET",
        url: "https://seesaawiki.jp/av_video/d/%c6%e1%b2%ec%ba%ea%a4%e6%a4%ad%a4%cd",
        responseType: "arraybuffer", // Get response as ArrayBuffer
        onload: function(response) {
            if (response.status >= 200 && response.status < 300) {
                // Convert ArrayBuffer to EUC-JP string
                const eucJpString = convertBufferToEucJp(response.response);

                // Do something with the EUC-JP string
                console.log(eucJpString);
            } else {
                console.error("Error fetching data:", response.status);
            }
        },
        onerror: function(error) {
            console.error("Request error:", error);
        },
    });

Answer 1

试了一下，把解码函数换成这个就可以了

const ab2str = (arrayBuf, encodeType) =>{
    var decoder = new TextDecoder(encodeType)
    var u8arr = new Uint8Array(arrayBuf)
    return decoder.decode(u8arr)
}

ab2str(response.response, 'EUC-JP')

参考来源：

• JS如何从ArrayBuffer中解码字符串 | Jack Huang's Blog