1:用ajax 来做个时间倒计时,并每隔一分种提交一次。

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var xmlHttpRequest;
?var timer;
?var saveTimer;

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?function createXMLHttpRequest() {//判断是否那种浏览器，并对不同浏览器进行创建xmlHttpRequest
??try {
???// Firefox, Opera 8.0+, Safari?????
???xmlHttpRequest = new XMLHttpRequest();
??} catch (e) {

???// Internet Explorer?????
???try {
????xmlHttpRequest = new ActiveXObject("Msxml2.XMLHTTP");
???} catch (e) {
????try {
?????xmlHttpRequest = new ActiveXObject("Microsoft.XMLHTTP");
????} catch (e) {
?????alert("您的浏览器不支持AJAX！");
?????return false;
????}
???}
??}

?}

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//发送请求函数?????
?function sendRequestPost(url, param) {
??createXMLHttpRequest();
??xmlHttpRequest.open("POST", url, true);
??xmlHttpRequest.setRequestHeader("Content-Type",
????"application/x-www-form-urlencoded");
??xmlHttpRequest.send(param);
?}
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?function saveData() {
??var article = document.getElementById("article").value;//获取id为article的变量的值
??var funcID = document.getElementById("funcID").value;//获取id为funcID的变量的值

??var dataID = document.getElementById("dataID").value;//获取id为dataID的变量的值

??var id = document.getElementById("id").value;//获取id为id的变量的值
??var url = "STUDone.do";//指定URL
??var param = encodeURIComponent("article") + "="
????+ encodeURIComponent(article) + "&"
????+ encodeURIComponent("funcID") + "="
????+ encodeURIComponent(funcID) + "&"
????+ encodeURIComponent("dataID") + "="
????+ encodeURIComponent(dataID) + "&" + encodeURIComponent("ID")
????+ "=" + encodeURIComponent(id);
??sendRequestPost(url, param);
?}
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?function timingProg() {

??var ss, mm;
??var temp;
??temp = document.getElementById('cdTime').innerHTML;

??mm = Number(temp.substring(0, temp.indexOf(":")));
??ss = Number(temp.substring(temp.indexOf(":") + 1));
??//时间到
??if (ss == 0 && mm == 0) {
???clearInterval(timer);
???clearInterval(saveTimer);
???//time out !!!
???document.getElementById('stu03Form').submit();
???return;
??}
??//时间在减少
??if (ss == 0) {
???ss = 60;
??}
??ss = ss - 1;
??if (ss == 59) {
???mm = mm - 1;
??}

??//转换回字符串，补0
??mm = String(mm);
??ss = String(ss);
??if (mm.length <= 1) {
???mm = '0' + mm;
??}
??if (ss.length <= 1) {
???ss = '0' + ss;
??}

??//输出到html
??document.getElementById('cdTime').innerHTML = mm + ':' + ss;

?}

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