Vue定义全局过滤器filter

时间:2021-07-12
本文章向大家介绍Vue定义全局过滤器filter,主要包括Vue定义全局过滤器filter使用实例、应用技巧、基本知识点总结和需要注意事项,具有一定的参考价值,需要的朋友可以参考一下。

Vue.js 自定义过滤器,为了对数据更方便的处理显示就需要用到过滤器

优点

1.过滤器可以串联

2.可以定义全局过滤器,复用性高

3.没有缓存,被调用时才计算

1.在main.js中引入和注册全局过滤器

// 过滤器
import * as filters from './filters'

Object.keys(filters).forEach(key => {
  Vue.filter(key, filters[key])
})

  

你可以在一个组件的选项中定义局部的过滤器,但只能在局部引用:

filters: {
  capitalize: function (value) {
    if (!value) return ''
    value = value.toString()
    return value.charAt(0).toUpperCase() + value.slice(1)
  }
}

整理的一些filter方法

export function filtersStr(value) {
if (value == '' || value == null || typeof (value) === 'undefined') {
    return '--'
  }
  return value
}

export
function filtersNum(value) { if (value == '' || value == null || typeof (value) === 'undefined') { return 0 } return value } /** * 格式化日期 * 格式化成类似 2019-07-18 11:54:16 */ export function formatDatetime (datetime) { if (datetime != null) { const dateMat = new Date(datetime); const year = dateMat.getFullYear(); const month = (dateMat.getMonth() + 1 < 10 ? "0" + (dateMat.getMonth() + 1) : dateMat.getMonth() + 1); const day = dateMat.getDate() < 10 ? "0" + dateMat.getDate() : dateMat.getDate(); const hh = dateMat.getHours() < 10 ? "0" + dateMat.getHours() : dateMat.getHours(); const mm = dateMat.getMinutes() < 10 ? "0" + dateMat.getMinutes() : dateMat.getMinutes(); const ss = dateMat.getSeconds() < 10 ? "0" + dateMat.getSeconds() : dateMat.getSeconds(); var timeFormat = year + '-' + month + '-' + day + ' ' + hh + ':' + mm + ':' + ss; return timeFormat; } } /** * 格式化日期 * 格式化成类似 2019-07-18 */ export function formatDate (date) { if (date != null) { const dateMat = new Date(date); const year = dateMat.getFullYear(); const month = (dateMat.getMonth() + 1 < 10 ? "0" + (dateMat.getMonth() + 1) : dateMat.getMonth() + 1); const day = dateMat.getDate() < 10 ? "0" + dateMat.getDate() : dateMat.getDate(); const timeFormat = year + '-' + month + '-' + day; return timeFormat; } }

使用

使用方法有两种

<!-- 在双花括号中 -->
{{ message | capitalize }}

<!-- 在 `v-bind` 中 -->
<div v-bind:id="rawId | formatId"></div>

把 filter.js 

// import parseTime, formatTime and set to filter
export { parseTime, formatTime } from '@/utils'
// export {showCal} from './returnLunarTime.js'
import moment from 'moment'

/**
 * Show plural label if time is plural number
 * @param {number} time
 * @param {string} label
 * @return {string}
 */
export function returnDateWeek(date) {
  var day = moment(date).format('YYYY-MM-DD')
  // console.log(moment(day).format('d'))
  return day;
}




export function pluralize(time, label) {
  if (time === 1) {
    return time + label
  }
  return time + label + 's'
}
export function filtersNum(value) {
  if (value == '' || value == null || typeof (value) === 'undefined') {
    return '0'
  }

  return value
}
export function filtersStr(value) {
  if (value == '' || value == null || typeof (value) === 'undefined') {
    return '--'
  }

  return value
}
export function filtersString(value) {
  if (value == '' || value == null || typeof (value) === 'undefined') {
    return '暂无'
  }

  return value
}

export function filtersWhether(value) {
  if (value == '' || value == null || typeof (value) === 'undefined') {
    return '否'
  }

  return '是'
}

export function returnDateMonth(value) {
  return moment(value).format('YYYY年MM月')
}
export function returnMonth(value) {
  return moment(value).format('MM')
}

export function returnDay(value) {
  return moment(value).format('DD')
}

export function returnAddMonth(value) {
  return moment(value).add(1, 'months')
}
export function returnWeek(value) {
  var d = moment(value).format('d')
  var str = ''
  if (d == 0) {
    str = '日'
  } else if (d == 1) {
    str = '一'
  } else if (d == 2) {
    str = '二'
  } else if (d == 3) {
    str = '三'
  } else if (d == 4) {
    str = '四'
  } else if (d == 5) {
    str = '五'
  } else if (d == 6) {
    str = '六'
  }
  return str
}

export function filterBr(value) {
  if (!value) return '--'
  var reg = new RegExp('<br>', 'g')
  var str = value.replace(reg, '\r\n')
  return str

}

export function formatPrice(value){
  if(value != '' && value != null && typeof(value) != 'undefined') {
    let tempVal = parseFloat(value).toFixed(3)
    let realVal = tempVal.substring(0,  tempVal.length - 1)
    return realVal
  }else {
    return  0;
  }

}

/*百分比 取两位小数*/
export function filterParseFloat(value) {
  // console.log(value)
  value = Number(value)
  if (value == '' || value == null || typeof(value) === 'undefined' || value==0 || value == NaN) {
    return  0
  }else {
    var val = (parseFloat(value) *100).toFixed(2)
  }
    return val
}

// 电话号码中间4位隐藏*表示
export function phoneNumFilter(phoneNum) {
  const str = String(phoneNum)
  const strLen = str.slice(-8, -4)
  return str.replace(strLen, '****') || '--'
}

/**
 * @param {number} time
 */
export function timeAgo(time) {
  const between = Date.now() / 1000 - Number(time)
  if (between < 3600) {
    return pluralize(~~(between / 60), ' minute')
  } else if (between < 86400) {
    return pluralize(~~(between / 3600), ' hour')
  } else {
    return pluralize(~~(between / 86400), ' day')
  }
}

/**
 * Number formatting
 * like 10000 => 10k
 * @param {number} num
 * @param {number} digits
 */
export function numberFormatter(num, digits) {
  const si = [
    { value: 1E18, symbol: 'E' },
    { value: 1E15, symbol: 'P' },
    { value: 1E12, symbol: 'T' },
    { value: 1E9, symbol: 'G' },
    { value: 1E6, symbol: 'M' },
    { value: 1E3, symbol: 'k' }
  ]
  for (let i = 0; i < si.length; i++) {
    if (num >= si[i].value) {
      return (num / si[i].value + 0.1).toFixed(digits).replace(/\.0+$|(\.[0-9]*[1-9])0+$/, '$1') + si[i].symbol
    }
  }
  return num.toString()
}

/**
 * 10000 => "10,000"
 * 千分号
 * toLocaleString()
 * @param {number} num
 */
export function toThousandFilter(num) {
  return (+num || 0).toString().replace(/^-?\d+/g, m => m.replace(/(?=(?!\b)(\d{3})+$)/g, ','))
}
/*千分号兼取两位小数*/
export function toThousandFloat(num) {
  if(num != '' && num != null && typeof(num) != 'undefined') {
    return  parseFloat(num).toFixed(2).replace(/(\d)(?=(\d{3})+\.)/g, '$1,')
  }else {
    return  0;
  }

}

/**
 * Upper case first char
 * @param {String} string
 */
export function uppercaseFirst(string) {
  return string.charAt(0).toUpperCase() + string.slice(1)
}
View Code

utils.js

/**
 * Created by PanJiaChen on 16/11/18.
 */
export function phoneNumFilter(phoneNum) {
  const str = String(phoneNum)
  const strLen = str.slice(-8, -4)
  return str.replace(strLen, '****')
}
/**
 * Parse the time to string
 * @param {(Object|string|number)} time
 * @param {string} cFormat
 * @returns {string}
 */
export function parseTime(time, cFormat) {
  if (arguments.length === 0) {
    return null
  }
  const format = cFormat || '{y}-{m}-{d} {h}:{i}:{s}'
  let date
  if (typeof time === 'object') {
    date = time
  } else {
    if ((typeof time === 'string') && (/^[0-9]+$/.test(time))) {
      time = parseInt(time)
    }
    if ((typeof time === 'number') && (time.toString().length === 10)) {
      time = time * 1000
    }
    date = new Date(time)
  }
  const formatObj = {
    y: date.getFullYear(),
    m: date.getMonth() + 1,
    d: date.getDate(),
    h: date.getHours(),
    i: date.getMinutes(),
    s: date.getSeconds(),
    a: date.getDay()
  }
  const time_str = format.replace(/{(y|m|d|h|i|s|a)+}/g, (result, key) => {
    let value = formatObj[key]
    // Note: getDay() returns 0 on Sunday
    if (key === 'a') { return ['日', '一', '二', '三', '四', '五', '六'][value ] }
    if (result.length > 0 && value < 10) {
      value = '0' + value
    }
    return value || 0
  })
  return time_str
}

/**
 * @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) {
    return parseTime(time, option)
  } else {
    return (
      d.getMonth() +
      1 +
      '月' +
      d.getDate() +
      '日' +
      d.getHours() +
      '时' +
      d.getMinutes() +
      '分'
    )
  }
}

/**
 * @param {string} url
 * @returns {Object}
 */
export function getQueryObject(url) {
  url = url == null ? window.location.href : url
  const search = url.substring(url.lastIndexOf('?') + 1)
  const obj = {}
  const reg = /([^?&=]+)=([^?&=]*)/g
  search.replace(reg, (rs, $1, $2) => {
    const name = decodeURIComponent($1)
    let val = decodeURIComponent($2)
    val = String(val)
    obj[name] = val
    return rs
  })
  return obj
}

/**
 * @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 {Object} json
 * @returns {Array}
 */
export function param(json) {
  if (!json) return ''
  return cleanArray(
    Object.keys(json).map(key => {
      if (json[key] === undefined) return ''
      return encodeURIComponent(key) + '=' + encodeURIComponent(json[key])
    })
  ).join('&')
}

/**
 * @param {string} url
 * @returns {Object}
 */
export function param2Obj(url) {
  const search = url.split('?')[1]
  if (!search) {
    return {}
  }
  return JSON.parse(
    '{"' +
      decodeURIComponent(search)
        .replace(/"/g, '\\"')
        .replace(/&/g, '","')
        .replace(/=/g, '":"')
        .replace(/\+/g, ' ') +
      '"}'
  )
}

/**
 * @param {string} val
 * @returns {string}
 */
export function html2Text(val) {
  const div = document.createElement('div')
  div.innerHTML = val
  return div.textContent || div.innerText
}

/**
 * Merges two objects, giving the last one precedence
 * @param {Object} target
 * @param {(Object|Array)} source
 * @returns {Object}
 */
export function objectMerge(target, source) {
  if (typeof target !== 'object') {
    target = {}
  }
  if (Array.isArray(source)) {
    return source.slice()
  }
  Object.keys(source).forEach(property => {
    const sourceProperty = source[property]
    if (typeof sourceProperty === 'object') {
      target[property] = objectMerge(target[property], sourceProperty)
    } else {
      target[property] = sourceProperty
    }
  })
  return target
}

/**
 * @param {HTMLElement} element
 * @param {string} className
 */
export function toggleClass(element, className) {
  if (!element || !className) {
    return
  }
  let classString = element.className
  const nameIndex = classString.indexOf(className)
  if (nameIndex === -1) {
    classString += '' + className
  } else {
    classString =
      classString.substr(0, nameIndex) +
      classString.substr(nameIndex + className.length)
  }
  element.className = classString
}

/**
 * @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())
  }
}

/**
 * @param {Function} func
 * @param {number} wait
 * @param {boolean} immediate
 * @return {*}
 */
export function debounce(func, wait, immediate) {
  let timeout, args, context, timestamp, result

  const later = function() {
    // 据上一次触发时间间隔
    const last = +new Date() - timestamp

    // 上次被包装函数被调用时间间隔 last 小于设定时间间隔 wait
    if (last < wait && last > 0) {
      timeout = setTimeout(later, wait - last)
    } else {
      timeout = null
      // 如果设定为immediate===true,因为开始边界已经调用过了此处无需调用
      if (!immediate) {
        result = func.apply(context, args)
        if (!timeout) context = args = null
      }
    }
  }

  return function(...args) {
    context = this
    timestamp = +new Date()
    const callNow = immediate && !timeout
    // 如果延时不存在,重新设定延时
    if (!timeout) timeout = setTimeout(later, wait)
    if (callNow) {
      result = func.apply(context, args)
      context = args = null
    }

    return result
  }
}

/**
 * This is just a simple version of deep copy
 * Has a lot of edge cases bug
 * If you want to use a perfect deep copy, use lodash's _.cloneDeep
 * @param {Object} source
 * @returns {Object}
 */
export function deepClone(source) {
  if (!source && typeof source !== 'object') {
    throw new Error('error arguments', 'deepClone')
  }
  const targetObj = source.constructor === Array ? [] : {}
  Object.keys(source).forEach(keys => {
    if (source[keys] && typeof source[keys] === 'object') {
      targetObj[keys] = deepClone(source[keys])
    } else {
      targetObj[keys] = source[keys]
    }
  })
  return targetObj
}

/**
 * @param {Array} arr
 * @returns {Array}
 */
export function uniqueArr(arr) {
  return Array.from(new Set(arr))
}

/**
 * @returns {string}
 */
export function createUniqueString() {
  const timestamp = +new Date() + ''
  const randomNum = parseInt((1 + Math.random()) * 65536) + ''
  return (+(randomNum + timestamp)).toString(32)
}

/**
 * Check if an element has a class
 * @param {HTMLElement} elm
 * @param {string} cls
 * @returns {boolean}
 */
export function hasClass(ele, cls) {
  return !!ele.className.match(new RegExp('(\\s|^)' + cls + '(\\s|$)'))
}

/**
 * Add class to element
 * @param {HTMLElement} elm
 * @param {string} cls
 */
export function addClass(ele, cls) {
  if (!hasClass(ele, cls)) ele.className += ' ' + cls
}

/**
 * Remove class from element
 * @param {HTMLElement} elm
 * @param {string} cls
 */
export function removeClass(ele, cls) {
  if (hasClass(ele, cls)) {
    const reg = new RegExp('(\\s|^)' + cls + '(\\s|$)')
    ele.className = ele.className.replace(reg, ' ')
  }
}
View Code

原文地址:https://www.cnblogs.com/liangyaofeng/p/15004238.html