function resetCoArr(){
        $("#loadSecond").html('');
        var checkUserConStr="<div class='form_row'><span class='span_title'></span><span class='span_contact'>"+
                                "<input type='button' value='检测用户' class='submit' onclick='checkUser()' />"+
                            "</span></div>";
        $("#checkUserCon").html(checkUserConStr);
    }
    function checkUser(){
        var login_username = $("#login_username").val();
        var login_password = $("#login_password").val();
        var urlStr='K_Login.php?action=loadCompany';
        var dataStr='&login_username='+login_username+'&login_password='+login_password;
        $.ajax({
                type:"POST",
                url:urlStr,
                data:dataStr,
                success: function (response) {
                    //alert(response);return;
                    var res_arr =  eval("(" + response + ")");
                    if(res_arr['error']!=1){
                        //报错
                        alert('用户名不存在或密码错误!');return;
                    }else{
                        $("#checkUserCon").html('');
                        var loadSecondStr='';
                            loadSecondStr+="<div class='form_row' id='co_name_con'>"+
                                                "<span class='span_title'>公司：</span>"+
                                                "<span class='span_contact'>"+
                                                    "<select class='contact_input' name='login_company' id='lv_co_id'>";
                            if(res_arr['loadCom'] != null && res_arr['loadCom'] != null){
                                for (var i = 0; i < res_arr['loadCom'].length; i++) {
                                    loadSecondStr+=    "<option selected='' value='"+res_arr['loadCom'][i]['co_id']+"'>"+res_arr['loadCom'][i]['co_name']+"</option>";
                                }
                            }
                            loadSecondStr+="</select>"+
                                           "</span> </div>"+
                                            "<div class='form_row'>"+ 
                                                "<span class='span_title'></span><span class='span_contact' style='_position:relative;'>"+
                                                    "<input type='button' value='登录' class='loginBtn' onclick='loginErp()' style='_position:relative;_position:absolute;_left:2px;_top:0px;'/>"+
                                                "</span>"+
                                            "</div>";
                                            alert(loadSecondStr);
                        $("#loadSecond").html(loadSecondStr);
                    }
                }  
        });    
    }