Lndj\Lcrawl::getGrade PHP Method

    public function getGrade()
    {
        //Get the hidden value.
        $response = $this->buildGetRequest(self::ZF_GRADE_URI, [], $this->headers);
        $viewstate = $this->parserOthersHiddenValue($response->getBody());
        $post['__EVENTTARGET'] = '';
        $post['__EVENTARGUMENT'] = '';
        $post['__VIEWSTATE'] = $viewstate;
        $post['hidLanguage'] = '';
        $post['ddlXN'] = '';
        $post['ddlXQ'] = '';
        $post['ddl_kcxz'] = '';
        $post['btn_zcj'] = iconv('utf-8', 'gb2312', '历年成绩');
        $response = $this->buildPostRequest(self::ZF_GRADE_URI, [], $post, $this->headers);
        return $this->parserCommonTable($response->getBody(), '#Datagrid1');
    }