/// <summary>
/// 返回页面时间
/// </summary>
/// <returns></returns>
public DateTime returnPageTime() //返回页面时间
{
wb.Forward();
var task1 = wb.GetSourceAsync();
task1.Wait();
string html = task1.Result;
var documenthtml = new JumonyParser().Parse(html);
string time = documenthtml.GetElementById("source").FindFirst(".time").InnerText().ToString();
return(DateTime.Parse(time));
}