musescore-downloader/src/utils.ts

export const getIndexPath = (id: number) => {
    const idStr = String(id)
    // 获取最后三位，倒序排列
    // x, y, z are the reversed last digits of the score id. Example: id 123456789, x = 9, y = 8, z = 7
    // https://developers.musescore.com/#/file-urls
    // "5449062" -> ["2", "6", "0"]
    const indexN = idStr.split("").reverse().slice(0, 3)
    return indexN.join("/")
}

export const waitForDocumentLoaded = (): Promise<void> => {
    if (document.readyState !== "complete") {
        return new Promise(resolve => {
            document.addEventListener("readystatechange", () => {
                if (document.readyState == "complete") {
                    resolve()
                }
            }, { once: true })
        })
    } else {
        return Promise.resolve()
    }
}