function init() {
    let request = new XMLHttpRequest();
    let data;
    let table = document.getElementById('dataTable');
    let strhtml, strsub;
    let rec;
    request.open('POST', 'http://39.108.111.147:7777/counter/data');
    request.responseType = 'text';
    request.onreadystatechange = function() {
        if (request.readyState==4 && request.status==200){
            data = JSON.parse(request.responseText);
            strhtml = `
                <tr>
                    <th>产品</th>
                    <th>版本</th>
                    <th>日期</th>
                    <th>代码关键字</th>
                    <th>计数</th>
                </tr>
                `;
            for (let i = 0; i < data.length; i++) {
                strsub = '';
                rec = data[i];
                strsub = strsub + '<td>' + rec.product + '</td>'
                    + '<td>' + rec.version + '</td>'
                    + '<td>' + rec.countdate + '</td>'
                    + '<td>' + rec.codekey + '</td>'
                    + '<td align="right">' + rec.counter + '</td>'
                strhtml = strhtml + '<tr>' + strsub + '</tr>';
            }
            table.innerHTML = strhtml;
        }
    };
    request.send();
}

window.onload = init;