用JavaScript查找本月的第二個和第四個星期二

Question

我的協會在每個月的第二個和第四個星期二召開會議，我真的很喜歡Javascript代碼，所以我不必每兩週更新一次我們的網站，下次會議的日期可以自動計算和顯示。

我真的很感謝一些幫助，因爲我絕對沒有使用Javascript的skils，只有CSS和HTML。

Answer 1

這是一個解決方案

HTML

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

的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：進一步證明你

的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