用Javascript查找每月的第二个和第四个星期二

Finding the second and fourth Tuesday of the month with Javascript

本文关键字：星期二 四个 查找 Javascript 第二个      更新时间：2023-09-26

我的协会在每个月的第二个和第四个星期二开会，我真的很想要一个Javascript代码，这样我就不必每两周更新我们的网站，下一次会议的日期可以自动计算和显示。

我真的很感激你的帮助，因为我绝对不会Javascript，只会CSS和HTML。

这是一个解决方案

HTML 

<ul id="list"></ul>
Javascript 

function getTuesdays(month, year) {
    var d = new Date(year, month, 1),
        tuesdays = [];
    d.setDate(d.getDate() + (9 - d.getDay()) % 7)
    while (d.getMonth() === month) {
        tuesdays.push(new Date(d.getTime()));
        d.setDate(d.getDate() + 7);
    }
    return tuesdays;
}
var meetingTuesdays = [],
    ul = document.getElementById("list"),
    temp,
    li,
    i;
for ( i = 0; i < 12; i += 1) {
    temp = getTuesdays(i, 2013);
    meetingTuesdays.push(temp[1]);
    li = document.createElement("li");
    li.textContent = temp[1];
    ul.appendChild(li);
    meetingTuesdays.push(temp[3]);
    li = document.createElement("li");
    li.textContent = temp[3];
    ul.appendChild(li);
}
console.log(meetingTuesdays);
在jsfiddle

更新:为您进一步演示

Javascript 

function getTuesdays(month, year) {
    var d = new Date(year, month, 1),
        tuesdays = [];
    d.setDate(d.getDate() + (9 - d.getDay()) % 7)
    while (d.getMonth() === month) {
        tuesdays.push(new Date(d.getTime()));
        d.setDate(d.getDate() + 7);
    }
    return tuesdays;
}
var today = new Date(),
    theseTuesdays = getTuesdays(today.getMonth(), today.getFullYear()),
    next;
theseTuesdays.some(function (tuesday, index) {
    if (index % 2 === 1 && tuesday > today) {
        next = tuesday;
        return true;
    }
    return false;
});
alert("Our next meeting is on : " + moment(next).format("MMMM Do YYYY"));
在jsfiddle

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