Recently I did a flash sale on real estate, an e-commerce website for group purchases (there are also flash sales on houses, the price is not small), there is a countdown display of the flash sale, mainly to determine how much time is left between the current time and the start of the flash sale, and also There are various displays showing the start of the flash sale and the end of the flash sale.
The most important point is that the so-called current time cannot use the client time obtained by the browser through new Date(). In this way, as long as the user modifies his or her machine time, the countdown will be messed up, so the current time must be The server time is used, so a static cache page is used, so the current time is obtained using ajax
< /title><br><meta http-equiv="Content-Type" content="text/html; charset=gb2312" /><br><meta http-equiv="Content-Language" content=" zh-CN" /><br><meta http-equiv="X-UA-Compatible" content="IE=EmulateIE7" /><br><meta content="all" name="robots" /><br><meta name="author" content="" /><br></head><br><body onload='start()'><br>.<br>There are still days until the event starts: <span id="sk_time"></span> <!-- This is the countdown display--><br>.<br><br/><br><span id="wyz"><br><span class="btn_02"> Participate in the flash sale! ! ! </span> <!-- This is a flash kill button. When the countdown reaches 0, it will become a flash kill style--><br></span><br>.<br><script type= "text/javascript"><br>var msbegintime = "1323446400000"; //This is the timestamp when the activity starts<br>var msendtime = "1325174400000"; //This is the timestamp when the activity ends<br>function start (){<br> callBackServerTime("sk_time", "wyz", msbegintime, msendtime);<br>}<br>//_showtimediv: time display area, _showqdiv: status display area<br>//This is sent to the server An ajax request, the server returns the current timestamp of the server, that is, xmlobj.responseText is a timestamp of the server<br>function callBackServerTime(_showtimediv, _showqdiv, _ms_begintime, _ms_endtime) {<br> var now = new Date();<br> var urlstr = "random=" Math.round(Math.random() * 10000000);<br> var ajaxobj = new AJAXRequest; // Create an AJAX object<br> ajaxobj.method = "GET"; // Settings The request method is GET<br> ajaxobj.url = "/gz/source/getServerTime.do?" urlstr; //Pay attention to the cross-domain issues of ajax<br> ajaxobj.callback = function(xmlobj) {<br> //ShowQTime (xmlobj.responseText, _showtimediv, _showqdiv, _ms_begintime, _ms_endtime, _tryid,sourceid); j.responseText is convenient for testing<br> }<br> ajaxobj.send(); // Send request<br>}<br>//Dynamic display of "flash sale" time function<br>function ShowQTime(_showtimediv, _showqdiv, _nowtime, _ms_begintime, _ms_endtime) {<br> _nowtime = Number(_nowtime);<br> var timmer = Math.floor((_ms_endtime - _nowtime) / (1000)); <br> if (_nowtime >= _ms_begintime && timmer > 0) {;<br> // Flash sale in progress <br> document.getElementById(_showtimediv).innerHTML = "<span class='pim_time'>0</span>days<span class='pim_time'>0</span>hours <span class='pim_time'>0</span>minutes<span class='pim_time'>0</span>seconds";<br> document.getElementById(_showqdiv).innerHTML = "<span class='btn_01'><a href='/gz/sk/v/'> The flash sale has begun! ! !</a></span>";<br> } else {<br> > var nD = Math.floor(nMS / (1000 * 60 * 60 * 24));<br> var nH = Math.floor(nMS / (1000 * 60 * 60)) % 24;<br> var nM = Math.floor(nMS / (1000 * 60)) % 60;<br> var nS = Math.floor(nMS / 1000) % 60;<br> var nMS = Math.floor(nMS / 100) % 10;<br> if (nD >= 0) {<br> var _timestr = "";<br> var snd = nD.toString();<br> if (snd.length == 1) {<br> snd = "0" snd;<br> }<br> _timestr = "<span class='pim_time'>" snd.substring(0, 1) snd.substring(1, 2) "</span>day" ;<br> var snH = nH.toString();<br> if (snH.length == 1) {<br> snH = "0" snH;<br> }<br> _timestr = "<span class ='pim_time'>" snH.substring(0, 1) snH.substring(1, 2) "</span>hour";<br> var snM = nM.toString();<br> .length == 1) {<br> 1, 2) "</span>minutes";<br> var snS = nS.toString();<br> if (snS.length == 1) {<br> snS = "0" snS;<br> (_showtimediv).innerHTML = _timestr;<br> day <span class='pim_time'>0</span>hours<span class='pim_time'>0</span>minutes<span class='pim_time'>0</span>seconds"; <br> document.getElementById(_showqdiv).innerHTML = "<span class='btn_01'><a href='/gz/sk/v/'> The flash sale is over! ! ! </a></span>";<br> }<br> }<br> //注意 (_nowtime 1000) 增加 1 秒<br> setTimeout("ShowQTime('" _showtimediv "','" _showqdiv "','" (_nowtime 1000) "','" _ms_begintime "','" _ms_endtime "')", 1000);<br>}<br>function AJAXRequest() {<br> var xmlObj = false;<br> var CBfunc,ObjSelf;<br> ObjSelf=this;<br> try { xmlObj=new XMLHttpRequest; }<br> catch(e) {<br> try { xmlObj=new ActiveXObject("MSXML2.XMLHTTP"); }<br> catch(e2) {<br> try { xmlObj=new ActiveXObject("Microsoft.XMLHTTP"); }<br> catch(e3) { xmlObj=false; }<br> }<br> }<br> if (!xmlObj) return false;<br> this.method="POST";<br> this.url;<br> this.async=true;<br> this.content="";<br> this.callback=function(cbobj) {return;}<br> this.send=function() {<br> if(!this.method||!this.url||!this.async) return false;<br> xmlObj.open (this.method, this.url, this.async);<br> if(this.method=="POST") xmlObj.setRequestHeader("Content-Type","application/x-www-form-urlencoded");<br> xmlObj.onreadystatechange=function() {<br> if(xmlObj.readyState==4) {<br> if(xmlObj.status==200) {<br> ObjSelf.callback(xmlObj);<br> }<br> }<br> }<br> if(this.method=="POST") xmlObj.send(this.content);<br> else xmlObj.send(null);<br> }<br>}<br></script><br></body><br></html><br>
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