您好我正在尝试使用以下代码，这是一个“提升代码”的混搭，但它一直在抽出今天的日期和时间。
我想把每个月的第一个星期二的日期定在19:00。
我正在使用W3C School Try-it进行测试。
<!DOCTYPE html>
<html>
<head>
<script>
function displayDate()
{
var myDate = new Date();
myDate.setHours(19, 00, 0, 0);
myDate.setYear(2013);
myDate.setDate(1);
myDate.setMonth();
//Find Tuesday
var tue = 2;
while(myDate.getDay() != tue) {
myDate.setDate(myDate.getDate() + 1);
}
document.write(myDate);
</script>
</head>
<body>
<h1>My First JavaScript</h1>
<p id="demo">This is a paragraph.</p>
<button type="button" onclick="displayDate()">Display Date</button>
</body>
</html>
罗伊
＆LT; ==更新==＆GT;
我已经使用了你的代码，该代码运行良好，但需要在下个月第一个星期二发生之后考虑因素，我已经尝试了这个if语句但是休息了。
function getTuesday() {
var datenow = new Date();
var d = new Date(),
month = d.getMonth(),
tuedays= [];
d.setDate(1);
// Get the first Monday in the month
while (d.getDay() !== 2) {
d.setDate(d.getDate() + 1);
}
// Get all the other Tuesdays in the month
while (d.getMonth() === month) {
tuedays.push(new Date(d.setHours(17,00,00,00)));
d.setDate(d.getDate() + 7);
}
If (d.getDate() >= datenow.getDate)
{
d.setMonth(d.getMonth() + 1);
document.write(tuedays[1]);
}
Else
{
document.write(tuedays[1]);
}
}
答案 0 :(得分：1)
使用以下功能，这将为您提供当前周二的月份。
function getTuesday() {
var d = new Date(),
month = d.getMonth(),
tuedays= [];
d.setDate(1);
// Get the first Monday in the month
while (d.getDay() !== 2) {
d.setDate(d.getDate() + 1);
}
// Get all the other Tuesdays in the month
while (d.getMonth() === month) {
tuedays.push(new Date(d.getTime()));
d.setDate(d.getDate() + 7);
}
return tuedays;
}
答案 1 :(得分：0)
我知道这很旧，但这是我根据Sahal编写的功能编写的功能，该功能接受了一些其他功能。生病的参数，然后返回下面。
function getDates(dayString, month, year, first, allInYear) {
if (!dayString) { console.error('Missing required parameter: dayString is required.'); return; }
if (first === undefined || first === null) { first = false; }
if (allInYear === undefined || allInYear === null) { allInYear = false; }
if (year === undefined || year === null) { year = new Date().getFullYear(); }
var converted = false;
if (month === undefined || month === null) {
var temp = new Date();
if (temp.getDate() > 9) {
month = ((temp.getMonth() + 1) == 12) ? 11 : (temp.getMonth() + 1);
} else {
month = temp.getMonth();
}
converted = true;
}
if (typeof month === "string" && isNaN(parseInt(month))) {
month = month.toLowerCase().substring(0, 3);
switch (month) {
case "jan":
month = 0;
break;
case "feb":
month = 1;
break;
case "mar":
month = 2;
break;
case "apr":
month = 3;
break;
case "may":
month = 4;
break;
case "jun":
month = 5;
break;
case "jul":
month = 6;
break;
case "aug":
month = 7;
break;
case "sep":
month = 8;
break;
case "oct":
month = 9;
break;
case "nov":
month = 10;
break;
case "dec":
month = 11;
break;
default:
var temp = new Date();
if (temp.getDate() > 9) {
month = ((temp.getMonth() + 1) == 12) ? 11 : (temp.getMonth() + 1);
} else {
month = temp.getMonth();
}
converted = true;
break;
}
} else if (typeof month === "number" || (typeof month === "string" && !isNaN(parseInt(month)))) {
month = (!converted) ? parseInt(month) - 1 : month;
}
if (typeof year === "string" && !isNaN(parseInt(year)) || typeof year === "number") {
if (parseInt(year) / 1000 > 2) {
year = parseInt(year);
} else if (parseInt(year) / 10 >= 0 && parseInt(year) / 10 < 10) {
var temp2 = new Date().getFullYear();
year = (parseInt(Math.floor(temp2 / 100)) * 100) + parseInt(year);
}
} else if (typeof year === "string" && isNaN(parseInt(year))) {
if (year === "this") {
year = new Date().getFullYear();
} else if (year === "last") {
year = new Date().getFullYear() - 1;
} else if (year === "next") {
year = new Date().getFullYear() + 1;
} else {
console.warn('Year string not recognized, falling back to current year. (this, last, next).');
year = new Date().getFullYear();
}
}
var dates = [];
//hang in there this is going to get a doosie
var d = new Date(),
dow = ["sun", "mon", "tue", "wed", "thu", "fri", "sat"],
getDow = function(sd, dowa) {
for (var i = 0; i < dowa.length; i++) {
var day = dowa[i];
if (sd.toLowerCase().substring(0, 3) == day) {
return i;
}
}
return -1;
},
di = getDow(dayString, dow),
getDIM = function(year, mon) {
var isLeap = ((year % 4) == 0 && ((year % 100) != 0 || (year % 400) == 0));
return [31, (isLeap ? 29 : 28), 31, 30, 31, 30, 31, 31, 30, 31, 30, 31][mon];
};
d.setFullYear(year);
d.setMonth(month, 1);
if (di == -1) { console.error('Range Error: Day of the week should be between sunday and saturday'); return; }
if (first && !allInYear) {
while (d.getDay() !== di) {
d.setDate(d.getDate() + 1);
}
return d;
} else if (first && allInYear) {
var tm = 0;
d.setMonth(tm, 1);
for (var i = tm; i <= 11; i++) {
while (d.getDay() !== di) {
d.setDate(d.getDate() + 1);
}
dates.push(new Date(d));
tm += 1;
d.setMonth(tm, 1);
}
return dates;
} else if (!first && !allInYear) {
var eom = getDIM(d.getFullYear(), d.getMonth());
for (var x = 1; x <= eom; x++) {
if (d.getDay() === di) {
dates.push(new Date(d));
}
d.setDate(d.getDate() + 1);
}
return dates;
} else if (!first && allInYear) {
var tm = 0;
for (var i = 0; i <= 11; i++) {
var eom = getDIM(d.getFullYear(), i),
dim = [];
d.setMonth(i, 1);
for (var x = 1; x <= eom && d.getMonth() == i; x++) {
if (d.getDay() === di) {
dim.push(new Date(d));
}
d.setDate(d.getDate() + 1);
}
dates.push(dim);
}
return dates;
} else {
return [];
}
}
因此，唯一需要的参数是天字符串，您可以选择将月，年，月中的第一个或全部以及是否在一年中的所有月，年和月默认设置为当前，而first和allInYear默认设置为false，但是您可以通过将null或undefined传递给month和year参数来设置优先。
month参数接受：null|undefined, number, or string eg 'July'
year参数接受：null|undefined, number 2 or 4 digit, string eg '19' or '2019' also 'last', 'this', 'next'
返回Date对象，Array [日期对象...]或Array [Array [日期对象...] ...]
这已经过测试，应该可以涵盖大多数情况...