php 间隔多长时间查询数据库记录显示-原创手记-慕课网

php 页面
<?php
header ( 'content-type:text/html;charset=utf-8' );
$mysqli = new mysqli ( 'localhost', 'root', '', 'java' );
if ($mysqli->connect_errno) {
die ( 'CONNECT ERROR:' . $mysqli->connect_error );
}
$mysqli->set_charset ( 'utf8' );
$sql = "select kd,sum from kd";
$mysqli_result = $mysqli->query ( $sql );

$rows = array ();
while ( $row = $mysqli_result->fetch_assoc () ) {
$rows [] = $row;
}
echo json_encode ( $rows );

html 页面
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<title>刷新</title>
<link rel="stylesheet" href="./kb.css" type="text/css" />
<script src="jquery-2.1.4.js" type="text/javascript" charset="utf-8"></script>
<script type="text/javascript">
$(function() {
updateMsg();
});

        function updateMsg() {
            $.post("getData.php", {
            }, function(json) {                    
                var arr=eval(json); 
                var tr=null;
                for(var i=0;i<arr.length;i++){
                    tr+="<tr>"+
                        "<td>"+arr[i].kd+"</td>"+
                        "<td>"+arr[i].sum+"</td>"+
                        "</tr>";                        
                }      
                $("#datatotable").html(tr);   
                setTimeout('updateMsg()', 60000);      
            });                                                          
        }
    </script>
</head>
<body>
    <div id="main">
        <table id="datatotable">

        </table>
    </div>
</body>

</html>