utils.js

import { DateTime } from 'luxon'

export const rand = function (n) {
  return (Math.floor(Math.random() * n + 1));
}
export const price = function (price) {
  return Number(Number(price).toFixed(2))
}
export const getSetting = function (settingKey, defaultValue) {
  let setting = localStorage.getItem(settingKey)
  if (setting) {
    try {
      setting = JSON.parse(setting)
    } catch (error) { }
  }
  return setting ? setting : defaultValue
}
export const saveSetting = function (settingKey, value) {
  return localStorage.setItem(settingKey, JSON.stringify(value))
}
export const readableTime = function (dateTime) {
  if (DateTime.local().hasSame(dateTime, 'day')) {
    return '今天 ' + dateTime.setLocale('zh-cn').toLocaleString(DateTime.TIME_SIMPLE)
  }
  if (DateTime.local().hasSame(dateTime.plus({ days: 1 }), 'day')) {
    return '昨天 ' + dateTime.setLocale('zh-cn').toLocaleString(DateTime.TIME_SIMPLE)
  }
  return dateTime.setLocale('zh-cn').toFormat('f')
}
export const versionCompare = function (v1, v2, options) {
  var lexicographical = options && options.lexicographical,
    zeroExtend = options && options.zeroExtend,
    v1parts = v1.split('.'),
    v2parts = v2.split('.');
  function isValidPart(x) {
    return (lexicographical ? /^\d+[A-Za-z]*$/ : /^\d+$/).test(x);
  }
  if (!v1parts.every(isValidPart) || !v2parts.every(isValidPart)) {
    return NaN;
  }
  if (zeroExtend) {
    while (v1parts.length < v2parts.length) v1parts.push("0");
    while (v2parts.length < v1parts.length) v2parts.push("0");
  }
  if (!lexicographical) {
    v1parts = v1parts.map(Number);
    v2parts = v2parts.map(Number);
  }
  for (var i = 0; i < v1parts.length; ++i) {
    if (v2parts.length == i) {
      return 1;
    }
    if (v1parts[i] == v2parts[i]) {
      continue;
    }
    else if (v1parts[i] > v2parts[i]) {
      return 1;
    }
    else {
      return -1;
    }
  }
  if (v1parts.length != v2parts.length) {
    return -1;
  }
  return 0;
}