cnwy-js-util/src/time/index.js

js常见的函数工具库

export function getDate(nDays) {
    // 获取当前日期
    let date = new Date();

    // 如果传参，则将日期设置为 nDays 天前
    if (nDays !== undefined) {
        date.setDate(date.getDate() - nDays);
    }

    // 格式化日期为 YYYY-MM-DD 格式
    let year = date.getFullYear();
    let month = date.getMonth() + 1;
    let day = date.getDate();
    month = month < 10 ? '0' + month : month;
    day = day < 10 ? '0' + day : day;

    return year + '-' + month + '-' + day;
}

/**
 * 表格时间格式化
 */
export function formatDate(cellValue) {
    if (cellValue == null || cellValue == '') return '';
    var date = new Date(cellValue);
    var year = date.getFullYear();
    var month = date.getMonth() + 1 < 10 ? '0' + (date.getMonth() + 1) : date.getMonth() + 1;
    var day = date.getDate() < 10 ? '0' + date.getDate() : date.getDate();
    var hours = date.getHours() < 10 ? '0' + date.getHours() : date.getHours();
    var minutes = date.getMinutes() < 10 ? '0' + date.getMinutes() : date.getMinutes();
    var seconds = date.getSeconds() < 10 ? '0' + date.getSeconds() : date.getSeconds();
    return year + '-' + month + '-' + day + ' ' + hours + ':' + minutes + ':' + seconds;
}

/**
 * @param {number} time
 * @param {string} option
 * @returns {string}
 */
export function formatTime(time, option) {
    if (('' + time).length === 10) {
        time = parseInt(time) * 1000;
    } else {
        time = +time;
    }
    const d = new Date(time);
    const now = Date.now();

    const diff = (now - d) / 1000;

    if (diff < 30) {
        return '刚刚';
    } else if (diff < 3600) {
        // less 1 hour
        return Math.ceil(diff / 60) + '分钟前';
    } else if (diff < 3600 * 24) {
        return Math.ceil(diff / 3600) + '小时前';
    } else if (diff < 3600 * 24 * 2) {
        return '1天前';
    }
    if (option) {
        // 时间转义
        // return parseTime(time, option);
    } else {
        return (
            d.getMonth() +
            1 +
            '月' +
            d.getDate() +
            '日' +
            d.getHours() +
            '时' +
            d.getMinutes() +
            '分'
        );
    }
}

/**
 * @param {string} input value
 * @returns {number} output value
 */
export function byteLength(str) {
    // returns the byte length of an utf8 string
    let s = str.length;
    for (var i = str.length - 1; i >= 0; i--) {
        const code = str.charCodeAt(i);
        if (code > 0x7f && code <= 0x7ff) s++;
        else if (code > 0x7ff && code <= 0xffff) s += 2;
        if (code >= 0xdc00 && code <= 0xdfff) i--;
    }
    return s;
}

/**
 * @param {Array} actual
 * @returns {Array}
 */
export function cleanArray(actual) {
    const newArray = [];
    for (let i = 0; i < actual.length; i++) {
        if (actual[i]) {
            newArray.push(actual[i]);
        }
    }
    return newArray;
}

/**
 * @param {string} type
 * @returns {Date}
 */
export function getTime(type) {
    if (type === 'start') {
        return new Date().getTime() - 3600 * 1000 * 24 * 90;
    } else {
        return new Date(new Date().toDateString());
    }
}