JavaScript日期大全-文本框里的时钟

<script LANGUAGE="JavaScript">
<!-- Begin
day = new Date();
miVisit = day.getTime();
function clock() {
today = new Date();
hrNow = today.getHours();
mnNow = today.getMinutes();
scNow = today.getSeconds();
miNow = today.getTime();
if (hrNow == 0) {
hour = 12;
ap = "A";
} else if(hrNow <= 11) {
ap = "A";
hour = hrNow;
} else if(hrNow == 12) {
ap = "P";
hour = 12;
} else if (hrNow >= 13) {
hour = (hrNow - 12);
ap = "P";
}
if (hrNow >= 13) {
hour = hrNow - 12;
}
if (mnNow <= 9) {
min = "0" + mnNow;
}
else (min = mnNow)
if (scNow <= 9) {
secs = "0" + scNow;
} else {
secs = scNow;
}
time = hour + ":" + min + ":" + secs + ap;
document.form.button.value = time;
setTimeout(''clock()'', 1000);
}
function timeInfo() {
milliSince = miNow;
milliNow = miNow - miVisit;
secsVisit = Math.round(milliNow / 1000);
minsVisit = (milliNow / 1000) / 60;
alert("给你提个醒： "
+ "你已经在本页面上停留了大约" + minsVisit + "分或"
+ secsVisit + "秒");
}
document.write("<left><form name=\"form\">"
+ "<input type=button value=\"Click for info!\""
+ " name=button onClick=\"timeInfo()\"></form></left>");
onError = null;
clock();
// End -->
</script>