使用 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(使用 Javascript 查找每月的第二个和第四个星期二)

问题描述

我的协会在每个月的第二个和第四个星期二举行会议，我非常想要一个 Javascript 代码，这样我就不必每两周更新一次我们的网站，并且可以计算和显示下一次会议的日期自动.

My association has meetings on the second and fourth Tuesday of each month and I'd really like a Javascript code so I don't have to update our site every two weeks and the date of the next meeting can be calculated and displayed automatically.

我非常感谢一些帮助，因为我完全没有 Javascript 方面的技能，只有 CSS 和 HTML.

I'd really appreciate some help, as I have absolutely no skils in Javascript, only in CSS and HTML.

推荐答案

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:为您提供进一步的演示

Update: a further demonstration for you

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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