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我正在製作一個純粹來自Javascript的日曆，但是當顯示上一個和下一個月時，當前內容仍然存在。它應該取代div的內容。另外，當前日期應該是唯一一個顯示紅色字體的日期。如何清除onclick div內容？
<html>
<head><script>
var now = new Date();
var year = now.getFullYear();
var month = now.getMonth();
var monthName = getMonthName(month);
var time = now.toLocaleTimeString();
var date = now.getDate();
now = null;
var calElem = document.getElementById("cal");
function febDays(year) {
if (year % 4 == 0) {
return 29;
} else {
return 28;
}
}
function getDays(month, year) {
var days = new Array(12);
days[0] = 31;
days[1] = febDays(year);
days[2] = 31;
days[3] = 30;
days[4] = 31;
days[5] = 30;
days[6] = 31;
days[7] = 31;
days[8] = 30;
days[9] = 31;
days[10] = 30;
days[11] = 31;
return days[month];
}
function getMonthName(month) {
var mn = new Array(12);
mn[0] = "January";
mn[1] = "February";
mn[2] = "March";
mn[3] = "April";
mn[4] = "May";
mn[5] = "June";
mn[6] = "July";
mn[7] = "August";
mn[8] = "September";
mn[9] = "October";
mn[10] = "November";
mn[11] = "December";
return mn[month];
}
function monthName(month) {
var mn = new Array(12);
mn[0] = "Jan";
mn[1] = "Feb";
mn[2] = "Mar";
mn[3] = "Apr";
mn[4] = "May";
mn[5] = "Jun";
mn[6] = "Jul";
mn[7] = "August";
mn[8] = "September";
mn[9] = "October";
mn[10] = "November";
mn[11] = "December";
return mn[month];
}
function setCal() {
var firstDay = new Date(year, month, 1);
var startDay = firstDay.getDay();
firstDay = null;
var days = getDays(month, year);
drawCal(startDay + 1, days, date, monthName, year, month);
}
function previousMonth() {
document.getElementById('cal').innerHTML = "";
month--;
var monthName = getMonthName(month);
var firstDay = new Date(year, month, 1);
var startDay = firstDay.getDay();
firstDay = null;
var days = getDays(month, year);
drawCal(startDay + 1, days, date, monthName, year, month);
if (monthName === "January"){
year--;
month = 11;
monthName = getMonthName(month);
firstDay = new Date(year, month, 1);
startDay = firstDay.getDay();
firstDay = null;
days = getDays(month, year);
drawCal(startDay + 1, days, date, monthName, year, month);
}
}
function nextMonth() {
document.getElementById('cal').innerHTML = "";
month++;
var monthName = getMonthName(month);
var firstDay = new Date(year, month, 1);
var startDay = firstDay.getDay();
firstDay = null;
var days = getDays(month, year);
drawCal(startDay + 1, days, date, monthName, year, month);
if (monthName === "December"){
year++;
month = 0;
monthName = getMonthName(month);
firstDay = new Date(year, month, 1);
startDay = firstDay.getDay();
firstDay = null;
days = getDays(month, year);
drawCal(startDay + 1, days, date, monthName, year, month);
}
}
function drawCal(startDay, lastDate, date, monthName, year, month) {
var headerHeight = 50;
var border = 2;
var cellspacing = 4;
var headerSize = "+3";
var colWidth = 60;
var dayCellHeight = 25;
var cellHeight = 40;
var todayColor = "red";
var text = "";
text += '<div id="cal">';
text += '<TABLE BORDER=' + border + ' CELLSPACING=' + cellspacing + '>';
text += '<TH COLSPAN=7 HEIGHT=' + headerHeight + '>';
text += '<FONT SIZE=' + headerSize + '>';
text += monthName + ' ' + year;
text += '</FONT>';
text += '</TH>';
var openCol = '<TD WIDTH=' + colWidth + ' HEIGHT=' + dayCellHeight + '>';
var closeCol = '</TD>';
var weekDay = new Array(7);
weekDay[0] = "Sunday";
weekDay[1] = "Monday";
weekDay[2] = "Tuesday";
weekDay[3] = "Wednesday";
weekDay[4] = "Thursday";
weekDay[5] = "Friday";
weekDay[6] = "Saturday";
text += '<TR ALIGN="center" VALIGN="center">';
for (var dayNum = 0; dayNum < 7; ++dayNum) {
text += openCol + weekDay[dayNum] + closeCol;
}
text += '</TR>';
var digit = 1;
var curCell = 1;
for (var row = 1; row <= Math.ceil((lastDate + startDay - 1)/7); ++row) {
text += '<TR ALIGN="right" VALIGN="top">';
for (var col = 1; col <= 7; ++col) {
if (digit > lastDate)
break;
if (curCell < startDay) {
text += '<TD></TD>';
curCell++;
} else {
if (digit == date) {
text += '<TD HEIGHT=' + cellHeight + '>';
text += '<FONT COLOR="' + todayColor + '">';
text += digit + " ";
text += '</FONT>';
text += '</TD>';
} else
text += '<TD HEIGHT=' + cellHeight + '>' + digit + '</TD>';
digit++;
}
}
text += '</TR>';
}
text += '</TABLE>';
text += '</CENTER>';
text += '</div>';
text += '<button onclick="previousMonth()"><</button>';
text += '<button onclick="nextMonth()">></button>';
document.write(text);
}
</script></head>
<body onload="setCal()">
</body>
</html>
是否可以添加事件到某個日期？ –