“User:Bhsd/widget/countdown.js”的版本间差异

2020年11月30日 (一) 01:16的版本

//<nowiki>
// 用于[[Widget:Countdown]]，可以使用ES6语法
"use strict";
(function() {
    const fromNow = function (ele) {
        const now = new Date(),
            then = new Date( ele.dataset.target ),
            before = ele.children[0],
            after = ele.children[1],
            i18n = ele.dataset.title,
            textMonth = i18n.slice(2, 4).replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;'),
            textHour = i18n.slice(0, 2).replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;'),
            isBefore = (then < now),
            monthsHave31Days = [0, 2, 4, 6, 7, 9, 11]; // 月份从0开始
        let year = isBefore ? now.getFullYear() - then.getFullYear() : then.getFullYear() - now.getFullYear(),
            month = isBefore ? now.getMonth() - then.getMonth() : then.getMonth() - now.getMonth(),
            day = isBefore ? now.getDate() - then.getDate() : then.getDate() - now.getDate(),
            hour = isBefore ? now.getHours() - then.getHours() : then.getHours() - now.getHours(),
            minute = isBefore ? now.getMinutes() - then.getMinutes() : then.getMinutes() - now.getMinutes(),
            second = isBefore ? now.getSeconds() - then.getSeconds() : then.getSeconds() - now.getSeconds(),
            result = "";
        if (second < 0) {
            minute--;
            second += 60;
        }
        if (minute < 0) {
            hour--;
            minute += 60;
        }
        if (hour < 0) {
            day--;
            hour += 24;
        }
        if (day < 0) {
            month--;
            if (monthsHave31Days.includes( (isBefore ? then : now).getMonth() )) { day += 31; }
            else if ((isBefore ? then : now).getMonth() === 1) {
                if ((isBefore ? then : now).getFullYear() % 4 === 0) { day += 29; }
                else { day += 28; }
            }
            else { day += 30; }
        }
        if (month < 0) {
            year--;
            month += 12;
        }
        if (year > 0) { result += `<span class="countdown-num">${year}</span>年`; }
        if (month > 0 || result !== "") { result += `<span class="countdown-num">${month}</span>${textMonth}`; }
        if (day > 0 || result !== "") { result += `<span class="countdown-num">${day}</span>天`; }
        if (year === 0 && month === 0) {
            if (hour > 0 || result !== "") { result += `<span class="countdown-num">${hour}</span>${textHour}`; }
            if (day === 0) {
                if (minute > 0 || result !== "") { result += `<span class="countdown-num">${minute}</span>分`; }
                if (second > 0 || result !== "") { result += `<span class="countdown-num">${second}</span>秒`; }
            }
        }
        if (isBefore) {
            const countdown = before.querySelector( '.countdown' );
            if (countdown) { countdown.innerHTML = result; }
            before.style.display = "";
            after.style.display = "none";
        }
        else {
            const countdown = after.querySelector( '.countdown' );
            if (countdown) { countdown.innerHTML = result; }
            after.style.display = "";
            before.style.display = "none";
        }
    },
        run = function() {
        document.querySelectorAll( '.countdownNode' ).forEach(ele => {
            if (ele.title) {
                ele.dataset.title = ele.title;
                ele.removeAttribute('title');
            }
            fromNow(ele);
            ele.style.visibility = "visible";
        });
    };
    document.querySelectorAll( '.countdownNode' ).forEach(ele => {
        // 补齐2位数日期
        const target = ele.dataset.target.replace( /-(\d)(?=\D)/g, '-0$1' ).replace( /-(\d)$/, '-0$1' ),
            time = new Date(target);
        if (!time.getTime()) {
            ele.classList.add( "error" );
            ele.textContent = "（时间格式错误！）";
            ele.classList.remove( 'countdownNode' );
            ele.removeAttribute('title');
        }
        else { ele.dataset.target = target; }
    });
    run();
    window.setInterval(run, 1000);
}) ();
//</nowiki>
// [[category:JavaScript小部件]] {{DEFAULTSORT:Countdown}}