export function uuid() {
    // A simplified UUID generator
    // - Current time (in millisecond)
    // - Some random number (around 1000~10000000)
    // E.g: 169e68f80c9-1b4104
    return new Date().getTime().toString(16) + "-" + Math.floor(Math.random() * 9999900 + 1000).toString(16);
}