高图未显示

Question

我使用了图表，我想显示数据库中的数据。问题是图表未显示。这是我第一次使用JSON。我的查询中出了什么问题，这就是为什么该图未显示的原因？

脚本

$(function() {
   $.getJSON('fetchdata.php',function($wv3) { 
       Highcharts.chart('container', {
                            chart: {
                                     type: 'line'
                                   },
                            title: {
                                     text: 'Daily Voltage'
                                   },
                            xAxis: {
                                    categories: ['12:00 AM', '1:00 AM', '2:00 AM', '3:00 AM', '4:00 AM', '5:00 AM', '6:00 AM', '7:00 AM', '8:00 AM', '9:00 AM', '10:00 AM', '11:00 AM','12:00 PM', '1:00 PM', '2:00 PM', '3:00 PM', '4:00 PM', '5:00 PM', '6:00 PM', '7:00 PM', '8:00 PM', '9:00 PM', '10:00 PM', '11:00 PM']
                                    },
                            yAxis: {
                                    title: {
                                       text: 'Voltage A'
                                        }
                                    },
                            plotOptions: {
                                    line: {
                                         dataLabels: {
                                             enabled: true
                                            },
                                         enableMouseTracking: false
                                        }
                                    },
                                    series: [{
                                        name: 'Feeder 1',
                                        data: wv3
                                    }]
                });
            });
        });

HTML

</div id="container" style="min-width: 310px; height: 400px; margin: 0 auto"></div> 

fetchdata.php

$weekly1 = "SELECT DISTINCT FORMAT(CAST(Batal_Feeder_1.time as datetime) , 'MM/dd/yyyy HH') as Time, 
                                Batal_Feeder_1.Ia, Batal_Feeder_1.Ib, Batal_Feeder_1.Ic, Batal_Feeder_1.Kwtotal, Batal_Feeder_1.pftotal,Batal_Feeder_1.Kwhtotal, Va AS VoltageA
                        FROM Batal_Feeder_1 
                        JOIN (
                                SELECT MIN(time) as mints FROM Batal_Feeder_1   
                                WHERE CONVERT(DATETIME, FLOOR(CONVERT(FLOAT, time))) = '".$_SESSION['date']."' 
                                GROUP BY CONVERT(date,time), DATEPART(hh, time)
                            )tt 
                        ON Batal_Feeder_1.time = tt.mints 
                        ORDER BY Time ASC";

                        $weekly2 = sqlsrv_query($db, $weekly1);

                        while($row = sqlsrv_fetch_array($weekly2)) {
                            $wv1 = $row['VoltageA'];
                            $wv2 = $row['time'];

                            $wv3[] = [$wv1];

                        }


                    echo json_encode($wv3);