Ajax實現不刷屏的前提下實現頁面定時刷新

2019-11-18 16:34:20

字體：大中小

來源：轉載

供稿：網友

主頁面（要求刷新的頁面）要求每一分鐘刷新一次系統時間

<html>

<body onload="makeRequest("getSystemTime.jsp")"> //創建httPRequest對象

<table>

<td colspan="2" align="center">
<div id="sysTimeShow"></div> //顯示平臺系統時間
</td>
</table></form>

</body>

</html>

getSystemTime.jsp //獲得系統的當前時間，也就是輸出結果的頁面

<%@ page language="java" %>
<%@ page contentType="text/html;charset=GB2312" %>
<%@ page import="java.util.Date"%>
<%@ page import="java.sql.Timestamp"%>
<%@ page import="java.io.IOException"%>

<%
Date d = new Date();
Timestamp ts = new Timestamp(d.getTime());
String result = ts.toString().substring(0,16);
out.write(result,0,result.length());
%>

Ajax.js

function makeRequest(url) {
http_request = false;
if (window.xmlHttpRequest) {
http_request = new xmlhttpRequest();
if (http_request.overrideMimeType){
   http_request.overrideMimeType('text/xml');
}
} else if (window.ActiveXObject) {
try{
   http_request = new ActiveXObject("Msxml2.XMLHTTP");
} catch (e) {
   try {
    http_request = new ActiveXObject("Microsoft.XMLHTTP");
   } catch (e) {
   }
}
}
if (!http_request) {
alert("您的瀏覽器不支持當前操作，請使用 IE 5.0 以上版本!");
return false;
}