public static class WebBrowerExtension
{
    /// <summary>
    /// 监听某个条件满足后(如UI元素渲染完毕)执行指定操作(多线程)
    /// </summary>
    /// <param name="condition">待满足条件(UI资源需满足跨线程访问)</param>
    /// <param name="operation">待执行操作((UI资源需满足跨线程访问))</param>
    /// <param name="timeOut">等待条件满足的超时时间</param>
    public static void WaitUtil(this WebBrowser brower, Predicate<WebBrowser> condition, Action<WebBrowser> operation, TimeSpan timeOut)
    {
        new Thread(() =>
        {
            Stopwatch watch = new Stopwatch();
            watch.Start();
            while (true)
            {
                //超时
                if (watch.Elapsed.TotalMilliseconds > timeOut.TotalMilliseconds)
                {
                    watch.Stop();
                    break;
                }

                if (condition(brower))
                {
                    operation(brower);
                    watch.Stop();
                    break;
                }
                Thread.Sleep(1000);
            }
        })
        { IsBackground = true }.Start();
    }


    /// <summary>
    /// 执行附加脚本
    /// </summary>
    /// <param name="browser">浏览器对象</param>
    /// <param name="script">待执行脚本</param>
    /// <param name="canBeCleared">脚本内容是否可以被清除(定时任务应设置为false)</param>
    public static void ExecuteScript(this WebBrowser browser, string script, bool canBeCleared = true)
    {
        var body = browser.Document.GetElementsByTagName("body")[0];
        var newScript = browser.Document.CreateElement("script");
        newScript.SetAttribute("canBeCleared", "true");
        newScript.InnerHtml = $"(function(){{$('[canBeCleared=true]').remove();{script}}})();";
        body.AppendChild(newScript);
    }
}