我将如何修复此功能以根据日期更改月份？

Question

我正在尝试创建一个函数，该函数根据字符串中提供的日期创建动态日期范围。到目前为止我做了什么：在我要更改的字符串中捕获日期；检查该日期是否为星期四（如果是，则该范围需要考虑周末）我需要做什么：找到一种方法来获取范围内的第二个日期以考虑周末；想办法确保第二个日期考虑到该月的最后一天。为旧语法道歉，GTM 不喜欢使用 ES6 的任何东西，所以我在这个项目上有点受限。注意我使用的是 DD/MM/YYYYvar regex = /[\d\/\d\/\d]/g;var text = dument.querySelector('.shipmentLineTitle b');var originalDate = text.innerText.match(regex, "");if (originalDate.length > 10) {    originalDate.pop();    originalDate.join('');}var ogDateString = originalDate.join('');var dayNumber = originalDate.splice(0, 2).join('');var monthNumber = originalDate.splice(1, 2).join('');var yearNumber = originalDate.splice(2, 4).join('');// if originalDate is a thursday (5) dynamicString will need to be a Monday (1).var date = new Date(yearNumber, monthNumber -1, dayNumber);var dynamicDateString = "";if (date.getDay == 5) {    var newDate = new Date(date) + (86400000 * 3);    var dd = newDate.getDate();    var mm = newDate.getMonth() +1;    var yy = newDate.getFullYear();    dymamicDateString = dd + '/' + mm + '/' + yy;} else {    var newDate = new Date(date) + 86400000;    var dd = newDate.getDate();    var mm = newDate.getMonth() +1;    var yy = newDate.getFullYear();    dynamicDateString = dd + '/' + mm + '/' + yy;}var newContent = 'Delivery will be made between ' + ogDateString + ' - ' + dynamicDateString + '. An accurate delivery date will be provided after you place your order.';text.innerText = newContent;<span class="shipmentLineTitle">Delivery details: <b>your delivery will arrive on 09/10/2020 (1 delivery)</b></span>

Answer 1

星期四是第 4 天

这是一个更简单的脚本

var textField = document.querySelector('.shipmentLineTitle b'),

  text = textField.innerText,

  originalDate = text.match(/\d{2}\/\d{2}\/\d{4}/)[0].split("/"),

  dayNumber = +originalDate[0],

  monthNumber = +originalDate[1],

  yearNumber = +originalDate[2],

  date = new Date(yearNumber, monthNumber - 1, dayNumber, 15, 0, 0, 0),

  aDay = 86400000,

  newDate = new Date(date),

  day = date.getDay(),

  daysToAdd = 1; // Sunday to Wednesday

// if originalDate is a Thursday (4) or Saturday (6), dynamicString will need to be a Monday (1).

if (day === 4) daysToAdd = 4; // Thursday - delivery Monday

else if (day === 6) daysToAdd = 2; // Saturday

newDate.setDate(newDate.getDate() + daysToAdd);

var dd = newDate.getDate(),

  mm = newDate.getMonth() + 1,

  yy = newDate.getFullYear(),

  dynamicDateString = dd + '/' + mm + '/' + yy,

  newContent = text + ' - ' + dynamicDateString + '</b>. An accurate delivery date will be provided after you place your order.';

textField.innerHTML = newContent;

<span class="shipmentLineTitle">Delivery details: <b>your delivery will arrive on 08/10/2020 (1 delivery)</b></span>

Answer 2

我建议用户 moment.js 一个非常好的日期库来操作日期。它有很多添加/减去日期、小时、天等的功能。