let ws = websocket();
let shouldExit = false;
while (!shouldExit) {
    let data = ws.readText();
    switch (data) {
        case "exit":
            shouldExit = true;
            break;
        case "panic":
            throw Error("错误");
        case "date":
            ws.writeText(new Date().toJSON())
            break
        default:
            ws.writeText("收到信息:" + data)
            break;
    }
}