停留时间

<script type="text/javascript">
 window.setTimeout('show_secs()');
 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() {
     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>
<form name="fm0" onsubmit="0">
    <p>
        <font size="3" color="#000000">
            停留时间
        </font>
        <input name="time_spent" onfocus="this.blur()" size="5">
    </p>
</form>