jquery表格插件datatable如何更换数据（重新加载别的数据）？

网上搜索，官网也看了，没找到解决方法，求助。<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <title></title>
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <title>AdminLTE 2 | Dashboard</title>
    <link rel="stylesheet" href="http://cdn.datatables.net/1.10.15/css/jquery.dataTables.min.css">
<script type="text/javascript" language="javascript" src="https://code.jquery.com/jquery-3.3.1.js"></script>
<script src="http://cdn.datatables.net/1.10.15/js/jquery.dataTables.min.js"></script>
</head>
<body>
<table id="example1" class="display" style="width:100%">
        <thead>
            <tr>
                <th>First name</th>
                <th>Last name</th>
                <th>Position</th>
                <th>Office</th>
                <th>Start date</th>
                <th>Salary</th>
            </tr>
        </thead>
        <tfoot>
            <tr>
                <th>First name</th>
                <th>Last name</th>
                <th>Position</th>
                <th>Office</th>
                <th>Start date</th>
                <th>Salary</th>
            </tr>
        </tfoot>
    </table>
<script>
//第一次加载的数据
var wjson=[{"DeviceModel": "HD-4CT","DeviceID": "7","AlarmDesc": "机箱门被打开","AlarmType": "6","OccurTime": "100304","OccurDate": "20190919"}, {"DeviceModel": "HD-4CT","DeviceID": "7","AlarmDesc": "机箱门关闭","AlarmType": "6","OccurTime": "100351","OccurDate": "20190919"}, {"DeviceModel": "HD-4CT","DeviceID": "7","AlarmDesc": "机箱门被打开","AlarmType": "6","OccurTime": "100403","OccurDate": "20190919"}, {"DeviceModel": "HD-4CT","DeviceID": "7","AlarmDesc": "机箱门关闭","AlarmType": "6","OccurTime": "100420","OccurDate": "20190919"}]
//第二次要加载的数据
var wjson2=[{"DeviceModel": "测试数据","DeviceID": "7","AlarmDesc": "测试数据","AlarmType": "6","OccurTime": "100304","OccurDate": "20190919"}, {"DeviceModel": "测试数据2","DeviceID": "7","AlarmDesc": "测试数据2","AlarmType": "6","OccurTime": "100351","OccurDate": "20190919"}, {"DeviceModel": "HD-4CT","DeviceID": "7","AlarmDesc": "测试数据2","AlarmType": "6","OccurTime": "100403","OccurDate": "20190919"}, {"DeviceModel": "测试数据3","DeviceID": "7","AlarmDesc": "测试数据3","AlarmType": "6","OccurTime": "100420","OccurDate": "20190919"}]$(document).ready(function() {
$('#example2').DataTable({
        'paging'      : true,
        'lengthChange': false,
        'searching'   : true,
        'ordering'    : true,
        'info'        : true,
        'autoWidth'   : false,
        'processing': true,
'destroy':true
   })

var tableww = $('#example1').DataTable( {
    data:wjson,    //第一次加载的数据
        "columns": [
            { "data": "DeviceModel" },
    { "data": "DeviceID" },
            { "data": "AlarmDesc" },
            { "data": "AlarmType" },
            { "data": "OccurTime" },
            { "data": "OccurDate" }
        ]
    } );
} );
//5秒后测试加载新的数据。
setTimeout(function(){
alert("aaa");
        var logtable = $('#example1').DataTable();
logtable.clear().draw();  //清理掉第一次的数据
//logtable.ajax.reload();
newload();    //加载新的数据
    }, 5000);

function newload(){
$('#example1').DataTable({
    data:wjson2,   //新数据
        "columns": [
            { "data": "DeviceModel" },
    { "data": "DeviceID" },
            { "data": "AlarmDesc" },
            { "data": "AlarmType" },
            { "data": "OccurTime" },
            { "data": "OccurDate" }
        ]
} );
}
</script>
</body>
</html>现在第一次加载的数据没问题，但是想重新加载第二次的数据，总是没法实现，求助下。