$ua->post( $url, \%form )

    $ua->post( $url, \@form )

    $ua->post( $url, \%form, $field_name => $value, ... )

    $ua->post( $url, $field_name => $value,... Content => \%form )

    $ua->post( $url, $field_name => $value,... Content => \@form )

    $ua->post( $url, $field_name => $value,... Content => $content )

        This method will dispatch a "POST" request on the given $url, with

        %form or @form providing the key/value pairs for the fill-in form

        content. Additional headers and content options are the same as for

        the get() method.

		这个方法会调用一个POST 请求在给定的$url上,使用%form 或者@form 提供键值对 对于填充内容,

		额外的 headers 和内存选项是和get()方法一样

		第一个参数是登陆的地址，第二个参数是一个匿名hash，第三个参数是请求头

		   my $url='https://wenjinbao.winfae.com/business/dispatch_post.do?action=submitAdminLogin';

   my $res = $ua->post($url,{

	                         'userName'=>'IT_public',

							 #'userName'=>'ITxxxx',

                             'userPass'=>'xxx',

						     'userPass1'=>'xx',

                            'validCode'=> "$validCode"

                                                  },

				'User-Agent'=>'Mozilla/5.0 (Windows NT 6.1; WOW64; rv:45.0) Gecko/20100101 Firefox/45.0',

                 'Host'=>'wenjinbao.winfae.com',

                 'Referer'=>'https://wenjinbao.winfae.com/backoffice/login.html'				

										);