JavaScript Study Notes (4) Countdown Program Code_Basic Knowledge

Deadline
< input type="text" value="2011-06-11" id="deadline" />

function countDown(endDate) {
var now = new Date();
var deadtime = document.getElementById(endDate);
var deadline = new Date(deadtime.value);
//The difference between local time and Greenwich Mean Time (GMT) Minute difference
var timeDiff = now.getTimezoneOffset();
//There is some confusion here. If the minute difference is converted into milliseconds, it should be timeDiff*60*1000, but the data returned in this way is incorrect!
var leave = Math.abs(deadline.getTime() - now.getTime() timeDiff*60);
var minute = 1000 * 60;
var hour = minute * 60;
var day = hour * 24;
var countDay = Math.floor(leave/day);
//var countHour = Math.floor((leave - day*countDay)/hour); Two calculation ideas
var countHour = Math.floor(leave/hour - countDay*24);
var countMinute = Math.floor(leave/minute) - countDay*24*60 - countHour*60;
var countSecond = Math. floor(leave/1000) - countDay*24*60*60 - countHour*60*60 - countMinute*60;
var outStr = "";
if(deadline < now) {
outStr = "distance" deadtime.value "has" countDay "days" countHour "hour" countMinute "minutes" countSecond "seconds";
} else {
outStr = "distance" deadtime.value "still has "countDay" days" countHour "hours" countMinute "minutes" countSecond "seconds";
}
var showTime = document.getElementById("showTime");
showTime.innerHTML = outStr;
}