随机数字加字幕id

const Util = window.Util || {};
Util.uniqueId = (length = 16, namespace = "jk") => {
    let text = "";
    const possible = "abcdefghijklmnopqrstuvwxyz0123456789";

    for (let i = 0; i < length; i++) {
        text = `${text}${possible.charAt(Math.floor(Math.random() * possible.length))}`;
    }
    return `${namespace}-${text}`;
};