JavaScript实例技巧精选(13)—计算在网页上的停留时间

>>点击这里下载完整html源码<<

这是截图:

核心代码如下：

 <SCRIPT LANGUAGE="JAVASCRIPT">
 <!--
 var ap_name = navigator.appName;
 var ap_vinfo = navigator.appVersion;
 var ap_ver = parseFloat(ap_vinfo.substring(0,ap_vinfo.indexOf('(')));
 var time_start = new Date();
 var clock_start = time_start.getTime();
 var dl_ok=false;
 function init ()
 {
 if(ap_name=="Netscape" && ap_ver>=3.0)
 dl_ok=true;
 return true;
 }
 function get_time_spent ()
 {
 var time_now = new Date();
 return((time_now.getTime() - clock_start)/1000);
 }
 function show_secs () // show the time user spent on the side
 {
 var i_total_secs = Math.round(get_time_spent());
 var i_secs_spent = i_total_secs % 60;
 var i_mins_spent = Math.round((i_total_secs-30)/60);
 var s_secs_spent = "" + ((i_secs_spent>9) ? i_secs_spent : "0" + i_secs_spent);
 var s_mins_spent ="" + ((i_mins_spent>9) ? i_mins_spent : "0" + i_mins_spent);
 document.fm0.time_spent.value = s_mins_spent + ":" + s_secs_spent;
 window.setTimeout('show_secs()',1000);
 }
 // -->
 </SCRIPT>