《Vue系列》timeago.js将时间戳转换成“几天前”“几分钟前”等格式

《Vue系列》timeago.js将时间戳转换成“几天前”“几分钟前”等格式

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1.引入timeago.js

/**
 * Copyright (c) 2016 hustcc
 * License: MIT
 * Version: v3.0.2
 * https://github.com/hustcc/timeago.js
**/
/* jshint expr: true */
!function (root, factory) {
  if (typeof module === 'object' && module.exports) {
    module.exports = factory(root); // nodejs support
    module.exports['default'] = module.exports; // es6 support
  }
  else
    root.timeago = factory(root);
}(typeof window !== 'undefined' ? window : this,
function () {
  var indexMapEn = 'second_minute_hour_day_week_month_year'.split('_'),
    indexMapZh = '秒_分钟_小时_天_周_月_年'.split('_'),
    // build-in locales: en & zh_CN
    locales = {
      'en': function(number, index) {
        if (index === 0) return ['just now', 'right now'];
        var unit = indexMapEn[parseInt(index / 2)];
        if (number > 1) unit += 's';
        return [number + ' ' + unit + ' ago', 'in ' + number + ' ' + unit];
      },
      'zh_CN': function(number, index) {
        if (index === 0) return ['刚刚', '片刻后'];
        var unit = indexMapZh[parseInt(index / 2)];
        return [number + unit + '前', number + unit + '后'];
      }
    },
    // second, minute, hour, day, week, month, year(365 days)
    SEC_ARRAY = [60, 60, 24, 7, 365/7/12, 12],
    SEC_ARRAY_LEN = 6,
    // ATTR_DATETIME = 'datetime',
    ATTR_DATA_TID = 'data-tid',
    timers = {}; // real-time render timers

  // format Date / string / timestamp to Date instance.
  function toDate(input) {
    if (input instanceof Date) return input;
    if (!isNaN(input)) return new Date(toInt(input));
    if (/^\d+$/.test(input)) return new Date(toInt(input));
    input = (input || '').trim().replace(/\.\d+/, '') // remove milliseconds
      .replace(/-/, '/').replace(/-/, '/')
      .replace(/(\d)T(\d)/, '$1 $2').replace(/Z/, ' UTC') // 2017-2-5T3:57:52Z -> 2017-2-5 3:57:52UTC
      .replace(/([\+\-]\d\d)\:?(\d\d)/, ' $1$2'); // -04:00 -> -0400
    return new Date(input);
  }
  // change f into int, remove decimal. Just for code compression
  function toInt(f) {
    return parseInt(f);
  }
  // format the diff second to *** time ago, with setting locale
  function formatDiff(diff, locale, defaultLocale) {
    // if locale is not exist, use defaultLocale.
    // if defaultLocale is not exist, use build-in `en`.
    // be sure of no error when locale is not exist.
    locale = locales[locale] ? locale : (locales[defaultLocale] ? defaultLocale : 'en');
    // if (! locales[locale]) locale = defaultLocale;
    var i = 0,
      agoin = diff < 0 ? 1 : 0, // timein or timeago
      total_sec = diff = Math.abs(diff);

    for (; diff >= SEC_ARRAY[i] && i < SEC_ARRAY_LEN; i++) {
      diff /= SEC_ARRAY[i];
    }
    diff = toInt(diff);
    i *= 2;

    if (diff > (i === 0 ? 9 : 1)) i += 1;
    return locales[locale](diff, i, total_sec)[agoin].replace('%s', diff);
  }
  // calculate the diff second between date to be formated an now date.
  function diffSec(date, nowDate) {
    nowDate = nowDate ? toDate(nowDate) : new Date();
    return (nowDate - toDate(date)) / 1000;
  }
  /**
   * nextInterval: calculate the next interval time.
   * - diff: the diff sec between now and date to be formated.
   *
   * What's the meaning?
   * diff = 61 then return 59
   * diff = 3601 (an hour + 1 second), then return 3599
   * make the interval with high performace.
  **/
  function nextInterval(diff) {
    var rst = 1, i = 0, d = Math.abs(diff);
    for (; diff >= SEC_ARRAY[i] && i < SEC_ARRAY_LEN; i++) {
      diff /= SEC_ARRAY[i];
      rst *= SEC_ARRAY[i];
    }
    // return leftSec(d, rst);
    d = d % rst;
    d = d ? rst - d : rst;
    return Math.ceil(d);
  }
  // get the datetime attribute, `data-timeagp` / `datetime` are supported.
  function getDateAttr(node) {
    return getAttr(node, 'data-timeago') || getAttr(node, 'datetime');
  }
  // get the node attribute, native DOM and jquery supported.
  function getAttr(node, name) {
    if(node.getAttribute) return node.getAttribute(name); // native
    if(node.attr) return node.attr(name); // jquery
  }
  // set the node attribute, native DOM and jquery supported.
  function setTidAttr(node, val) {
    if(node.setAttribute) return node.setAttribute(ATTR_DATA_TID, val); // native
    if(node.attr) return node.attr(ATTR_DATA_TID, val); // jquery
  }
  // get the timer id of node.
  // remove the function, can save some bytes.
  // function getTidFromNode(node) {
  //   return getAttr(node, ATTR_DATA_TID);
  // }
  /**
   * timeago: the function to get `timeago` instance.
   * - nowDate: the relative date, default is new Date().
   * - defaultLocale: the default locale, default is en. if your set it, then the `locale` parameter of format is not needed of you.
   *
   * How to use it?
   * var timeagoLib = require('timeago.js');
   * var timeago = timeagoLib(); // all use default.
   * var timeago = timeagoLib('2016-09-10'); // the relative date is 2016-09-10, so the 2016-09-11 will be 1 day ago.
   * var timeago = timeagoLib(null, 'zh_CN'); // set default locale is `zh_CN`.
   * var timeago = timeagoLib('2016-09-10', 'zh_CN'); // the relative date is 2016-09-10, and locale is zh_CN, so the 2016-09-11 will be 1天前.
  **/
  function Timeago(nowDate, defaultLocale) {
    this.nowDate = nowDate;
    // if do not set the defaultLocale, set it with `en`
    this.defaultLocale = defaultLocale || 'en'; // use default build-in locale
    // for dev test
    // this.nextInterval = nextInterval;
  }
  // what the timer will do
  Timeago.prototype.doRender = function(node, date, locale) {
    var diff = diffSec(date, this.nowDate),
      self = this,
      tid;
    // delete previously assigned timeout's id to node
    node.innerHTML = formatDiff(diff, locale, this.defaultLocale);
    // waiting %s seconds, do the next render
    timers[tid = setTimeout(function() {
      self.doRender(node, date, locale);
      delete timers[tid];
    }, Math.min(nextInterval(diff) * 1000, 0x7FFFFFFF))] = 0; // there is no need to save node in object.
    // set attribute date-tid
    setTidAttr(node, tid);
  };
  /**
   * format: format the date to *** time ago, with setting or default locale
   * - date: the date / string / timestamp to be formated
   * - locale: the formated string's locale name, e.g. en / zh_CN
   *
   * How to use it?
   * var timeago = require('timeago.js')();
   * timeago.format(new Date(), 'pl'); // Date instance
   * timeago.format('2016-09-10', 'fr'); // formated date string
   * timeago.format(1473473400269); // timestamp with ms
  **/
  Timeago.prototype.format = function(date, locale) {
    return formatDiff(diffSec(date, this.nowDate), locale, this.defaultLocale);
  };
  /**
   * render: render the DOM real-time.
   * - nodes: which nodes will be rendered.
   * - locale: the locale name used to format date.
   *
   * How to use it?
   * var timeago = require('timeago.js')();
   * // 1. javascript selector
   * timeago.render(document.querySelectorAll('.need_to_be_rendered'));
   * // 2. use jQuery selector
   * timeago.render($('.need_to_be_rendered'), 'pl');
   *
   * Notice: please be sure the dom has attribute `datetime`.
  **/
  Timeago.prototype.render = function(nodes, locale) {
    if (nodes.length === undefined) nodes = [nodes];
    for (var i = 0, len = nodes.length; i < len; i++) {
      this.doRender(nodes[i], getDateAttr(nodes[i]), locale); // render item
    }
  };
  /**
   * setLocale: set the default locale name.
   *
   * How to use it?
   * var timeago = require('timeago.js')();
   * timeago.setLocale('fr');
  **/
  Timeago.prototype.setLocale = function(locale) {
    this.defaultLocale = locale;
  };
  /**
   * timeago: the function to get `timeago` instance.
   * - nowDate: the relative date, default is new Date().
   * - defaultLocale: the default locale, default is en. if your set it, then the `locale` parameter of format is not needed of you.
   *
   * How to use it?
   * var timeagoFactory = require('timeago.js');
   * var timeago = timeagoFactory(); // all use default.
   * var timeago = timeagoFactory('2016-09-10'); // the relative date is 2016-09-10, so the 2016-09-11 will be 1 day ago.
   * var timeago = timeagoFactory(null, 'zh_CN'); // set default locale is `zh_CN`.
   * var timeago = timeagoFactory('2016-09-10', 'zh_CN'); // the relative date is 2016-09-10, and locale is zh_CN, so the 2016-09-11 will be 1天前.
   **/
  function timeagoFactory(nowDate, defaultLocale) {
    return new Timeago(nowDate, defaultLocale);
  }
  /**
   * register: register a new language locale
   * - locale: locale name, e.g. en / zh_CN, notice the standard.
   * - localeFunc: the locale process function
   *
   * How to use it?
   * var timeagoFactory = require('timeago.js');
   *
   * timeagoFactory.register('the locale name', the_locale_func);
   * // or
   * timeagoFactory.register('pl', require('timeago.js/locales/pl'));
   **/
  timeagoFactory.register = function(locale, localeFunc) {
    locales[locale] = localeFunc;
  };

  /**
   * cancel: cancels one or all the timers which are doing real-time render.
   *
   * How to use it?
   * For canceling all the timers:
   * var timeagoFactory = require('timeago.js');
   * var timeago = timeagoFactory();
   * timeago.render(document.querySelectorAll('.need_to_be_rendered'));
   * timeagoFactory.cancel(); // will stop all the timers, stop render in real time.
   *
   * For canceling single timer on specific node:
   * var timeagoFactory = require('timeago.js');
   * var timeago = timeagoFactory();
   * var nodes = document.querySelectorAll('.need_to_be_rendered');
   * timeago.render(nodes);
   * timeagoFactory.cancel(nodes[0]); // will clear a timer attached to the first node, stop render in real time.
   **/
  timeagoFactory.cancel = function(node) {
    var tid;
    // assigning in if statement to save space
    if (node) {
      tid = getAttr(node, ATTR_DATA_TID); // get the timer of DOM node(native / jq).
      if (tid) {
        clearTimeout(tid);
        delete timers[tid];
      }
    } else {
      for (tid in timers) clearTimeout(tid);
      timers = {};
    }
  };

  return timeagoFactory;
});

2.在vue分过滤器中定义changeTime方法

filters: {
    //计算时间,类似于几分钟前,几小时前,几天前等
    changeTime(val){
        let time = new Date(val); //先将接收到的json格式的日期数据转换成可用的js对象日期
        return new timeago().format(time, 'zh_CN'); //转换成类似于几天前的格式
    }
}

3.在template中使用,例如:

time是需要转换的时间戳,changeTime是过滤器中定义的方法

<span>{{time | changeTime}}</span>