public function call($api, $param = '', $method = 'GET')
{
/* 淘宝网调用公共参数 */
$params = ['method' => $api, 'access_token' => $this->token['access_token'], 'format' => 'json', 'v' => '2.0'];
$data = $this->http($this->url(''), $this->param($params, $param), $method);
return json_decode($data, true);
}