前端工具函数-避免重复造轮子

工作中老是会使用到一些常用的工具函数，如对象克隆，文件流下载等，每次都重新写就很烦还浪费时间，直接影响下班时间，今儿记录一下个人平时常用的一些工具函数。

判断是否为IE浏览器

	export function isIE () {
	  const bw = window.navigator.userAgent
	  const compare = (s) => bw.indexOf(s) >= 0
	  const ie11 = (() => 'ActiveXObject' in window)()
	  return compare('MSIE') || ie11
	}

判断是否为全屏显示

	/**
	 * @function 判断是否处于全屏显示
	 * @returns {boolean}
	 */
	export function isFullScreen () {
	  if (document.fullscreen) {
	    return true;
	  } else if (document.mozFullScreen) {
	    return true;
	  } else if (document.webkitIsFullScreen) {
	    return true;
	  } else if (document.msFullscreenElement) {
	    return true;
	  } else if (window.fullScreen) {
	    return true;
	  }
	  return false;
	}

退出全屏

	/**
	 * @function 退出全屏
	 * @returns {undefined}
	 */
	export function exitFullscreen () {
	  if (document.exitFullscreen) {
	    document.exitFullscreen();
	  } else if (document.mozCancelFullScreen) {
	    document.mozCancelFullScreen();
	  } else if (document.webkitExitFullscreen) {
	    document.webkitExitFullscreen();
	  }
	}

全屏显示

	/**
	 * @function 全屏显示 如果已是全屏显示则退出全屏
	 * @param {HTMLElement} element 
	 * @returns {boolean}
	 * launchFullScreen(document.documentElement); // 整个网页
	 * launchFullScreen(document.getElementById("videoElement")); // 某个页面元素
	 */
	export function launchFullscreen (element) {
	  if (isFullScreen()) {// 如果用户在全屏模式下测退出全屏
	    exitFullscreen()
	    return false
	  }
	  if (element.requestFullscreen) {
	    element.requestFullscreen();
	    return true
	  } else if (element.mozRequestFullScreen) {
	    element.mozRequestFullScreen();
	    return true
	  } else if (element.webkitRequestFullscreen) {
	    element.webkitRequestFullscreen();
	    return true
	  } else if (element.msRequestFullscreen) {
	    element.msRequestFullscreen();
	    return true
	  }
	}

触发window.resize事件

	export function triggerWindowResizeEvent () {
	  const event = document.createEvent('HTMLEvents')
	  event.initEvent('resize', true, true)
	  event.eventType = 'message'
	  window.dispatchEvent(event)
	}

文件流下载

	/**
	 * @function 下载文件
	 * @param {object} data 文件对象
	 * @param {string} original 下载文件名称
	 * @param {string} msg 消息
	 * @param {Function}  callback 回调
	 * @returns {undefined}
	 * @type {undefined}
	 * @version 1.0
	 * @author 小明
	 */
	export function exportNetdot (data, original, msg = '导出成功', callback) {
	  try {
	    if (data.fileName) {
	      original = decodeURI(data.fileName).split('=')
	      original = original[original.length - 1]
	    }
	  } catch (error) {
	    console.error(error)
	  }
	  const typeObj = {
	    type: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
	  }
	  const url = window.URL.createObjectURL(new Blob([data.data], typeObj));
	  console.log(url);
	  const link = document.createElement('a');
	  link.href = url
	  link.download = original;
	  document.body.appendChild(link);
	  link.click();
	  window.setTimeout(() => {
	    if (this) this.$message.success(msg)
	    document.body.removeChild(link);
	    callback && callback()
	  }, 0);
	}

文件压缩

	// 安装  npm i jszip
	const JSZip = require('jszip');
	/**
	 * 依赖 npm i jszip
	 * @function 文件压缩
	 * @param {object} file 
	 * @param {string} zipName 
	 * @returns {undefined}
	 * @version 1.0
	 * @author 小明
	 */
	export function exportZip (file, zipName) {
	  const zip = new JSZip();
	  zip.file(file.name, file);
	  zip.generateAsync({ type: 'blob' }).then((content) => {
	    // content 压缩文件流
	    exportNetdot({ data: content }, zipName)
	  });
	}

导出Excel

	/**
	 * 依赖 npm i js-export-excel
	 * @function 导出excel
	 * @param {object} option excel配置对象
	 *  具体可以参考：https://blog.youkuaiyun.com/weixin_43376417/article/details/124665752?spm=1001.2014.3001.5501
	 * @returns {undefined}
	 * @version 1.0
	 * @author 小明
	 */
	export function exportExcelMode (option) {
	  var toExcel = new ExportJsonExcel(option);
	  const file = toExcel.saveExcel()
	  // 如果有返回则是一个文件流
	  if (!file) return
	  exportZip(file, option.zipFileName || 'test-zip.zip')
	}

crypto-js加密解密

	/**
	 * 依赖 npm i crypto-js
	 * @function 基于crypto-js的加解密
	 * @property genKey,encrypt,decrypt
	 */
	let CryptoJS = require('crypto-js')
	export const aesUtil = {
	
	  /**
	   * @function 生成key 如果在不需要解密的情况可以直接使用这个获取key
	   * @param {number} length 需要生成key的长度
	   * @returns {string} key
	   */
	  genKey: function (length = 16) {
	    let random = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
	    let str = "";
	    for (let i = 0; i < length; i++) {
	      str = str + random.charAt(Math.random() * random.length)
	    }
	    return str;
	  },
	
	  /**
	   * @function 完成加密
	   * @param {any} plaintext 需要加密的数据
	   * @param {string} key 参与加密的key,
	   * @returns {string} 生成得加密字符串
	   */
	  encrypt: function (plaintext, key = 'MIGfMA0GCSqGSIb3') {
	    if (plaintext instanceof Object) {
	      plaintext = JSON.stringify(plaintext)
	    }
	    let encrypted = CryptoJS.AES.encrypt(CryptoJS.enc.Utf8.parse(plaintext), CryptoJS.enc.Utf8.parse(key), { mode: CryptoJS.mode.ECB, padding: CryptoJS.pad.Pkcs7 });
	    return encrypted.toString();
	  },
	  /**
	   * @function 解密 解密key必须与加密保存一致
	   * @param {string} ciphertext 要解密的字符串
	   * @param {strign} key 参与加密的key
	   * @returns {any} 解密成功的数据
	   */
	  decrypt: function (ciphertext, key = 'MIGfMA0GCSqGSIb3') {
	    try {
	      let decrypt = CryptoJS.AES.decrypt(ciphertext, CryptoJS.enc.Utf8.parse(key), { mode: CryptoJS.mode.ECB, padding: CryptoJS.pad.Pkcs7 });
	      let decString = CryptoJS.enc.Utf8.stringify(decrypt).toString();
	      if (decString.charAt(0) === "{" || decString.charAt(0) === "[") {
	        decString = JSON.parse(decString);
	      }
	      return decString;
	    } catch (err) {
	      return { msg: '解密失败' }
	    }
	  }
	}

判断原始类型，Object.prototype.toString.apply([]) ‘[object Array]’

	/**
	 * @function 判断数据的类型
	 * @param {object} prop 需要判断类型的参数
	 * @returns {string}
	 * @version 1.0
	 * @author 小明
	 */
	export function getObjType (prop) {
	  const map = {
	    '[object Boolean]': 'boolean',
	    '[object Number]': 'number',
	    '[object String]': 'string',
	    '[object Function]': 'function',
	    '[object Array]': 'array',
	    '[object Date]': 'date',
	    '[object RegExp]': 'regExp',
	    '[object Undefined]': 'undefined',
	    '[object Null]': 'null',
	    '[object Object]': 'object'
	  }
	  return map[Object.prototype.toString.call(prop)]
	}

对象深度拷贝

	/**
	 * @function 对象深度克隆
	 * @param {any} data 要克隆的参数
	 * @returns {any}
	 */
	export function deepClone (data) {
	  var type = getObjType(data)
	  var obj
	  if (type === 'array') {
	    obj = []
	  } else if (type === 'object') {
	    obj = {}
	  } else {
	    // 不再具有下一层次
	    return data
	  }
	  if (type === 'array') {
	    for (var i = 0, len = data.length; i < len; i++) {
	      obj.push(deepClone(data[i]))
	    }
	  } else if (type === 'object') {
	    for (var key in data) {
	      obj[key] = deepClone(data[key])
	    }
	  }
	  return obj
	}

对象深度拷贝方案二

/**
 * 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;
}

数据校验

	/**
	 * @function 校验数据
	 * @param {object} info 需要校验的数据
	 * @param {object} rule 校验规则
	 * @returns {boolean || string}
	 * info={ticketPrice:'',adjustPrice:''}
	 * rule={
	        ticketPrice: [
	          { required: true, message: '请输入票面金额' },
	          { pattern: /^[0-9.]{1,50}$/, message: '必须是0以上的数字' },
	        ],
	        adjustPrice: [
	          { required: true, message: '请输入上浮金额' },
	          { pattern: /^[0-9.]{1,50}$/, message: '必须是0以上的数字' },
	        ],
	      }
	 */
	export function rules (info, rule) {
	  for (var i in rule) {
	    if (info[i] === undefined) {
	      console.log('没有' + info[i])
	      return false // 没有就不校验
	    }
	    for (let j = 0; j < rule[i].length; j++) {
	      // 判断是否是必填项
	      if (rule[i][j].required) {
	        if (info[i] == '') {
	          return rule[i][j].message
	        }
	      }
	      //判断最小输入值min
	      if (rule[i][j].min) {
	        if (info[i].length < rule[i][j].min) {
	          return rule[i][j].message
	        }
	      }
	      //判断最大输入值max
	      if (rule[i][j].max) {
	        if (info[i].length > rule[i][j].max) {
	          return rule[i][j].message
	        }
	      }
	      // 判断是否相同
	      if (rule[i][j].equal) {
	        const str = rule[i][j].equal
	        if (info[i] !== info[str]) {
	          return rule[i][j].message
	        }
	      }
	      // 正则判断pattern
	      if (rule[i][j].pattern) {
	        if (!rule[i][j].pattern.test(info[i])) {
	          return rule[i][j].message
	        }
	      }
	      // 判断数组长度
	      if (rule[i][j].arrlength) {
	        if (rule[i][j].arrlength != info[i].length) {
	          return rule[i][j].message
	        }
	      }
	    }
	  }
	  return false
	}

时间转换

这里是用ts写的，如果是js的话删除类型标注就可以了。

class newData extends Date {
  /**
   * 格式转换
   * @param day 日期格式 YYYY-MM-DD hh:mm:ss 大写HH是12小时制，小写hh是24小时
   * @returns 
   */
  format(day = 'YYYY-MM-DD'){
    const date = this
		let y = date.getFullYear();
		let MM = date.getMonth() + 1 as number;
		MM = MM < 10 ? "0" + MM : MM;
		let d = date.getDate();
		d = d < 10 ? "0" + d : d;
		let h = date.getHours();
		h = h < 10 ? "0" + h : h;
		let h12 = h > 12 ? h - 12 : Number(h);
		h12 = h12 < 10 ? "0" + h12 : h12;
		let m = date.getMinutes();
		m = m < 10 ? "0" + m : m;
		let s = date.getSeconds();
		s = s < 10 ? "0" + s : s;
		const str = day.replace('YYYY', y).replace('MM', MM).replace('DD', d).replace('HH', h12).replace('hh', h).replace('mm', m).replace('ss',s)
			.replace('ss', s)
		return str
  }
}
/**
 * 日期格式转换
 * @param value date
 * @returns 
 */
export function moment(value:Date|string|number) {
	if (typeof value === 'string') value = Number(value)
	let date = value ? new newData(value) : new newData();
	return date
}

获取某月共有多少天

/**
 * 获取某月共有多少天-不传参数就是获取当月
 * @param year 年份
 * @param month 月份
 */
export function getMonthDayNum(year,month){
  let date = null
  if(year && month){
    date = new Date(year,month,0)
  }else{
    const d = new Date()
    date = new Date(d.getFullYear(),d.getMonth()+1,0)
  }
  return date.getDate()
}

数组对象去重

	/**
	 * 对象数组去重
	 * @param Arr 要去重的数组
	 * @param key 去重的key
	 * @return Array
	 */
	export const objArrSet = (Arr, key) => {
	  let obj = {}
	  return Arr.reduce((setArr, item) => {
	    obj[item[key]] ? '' : (obj[item[key]] = setArr.push(item))
	    return setArr
	  }, [])
	}

防抖

	/**
	 * 使用闭包封装防抖函数
	 * @param {*} Callback 
	 * @param {*} delayTime 
	 * @returns 
	 */
	export const debounceEvent = (Callback, delayTime) => {
	  let timer = null
	  return function (...agmes) {
	    if (timer) clearTimeout(timer)
	    timer = setTimeout(() => {
	      Callback.apply(this, [...agmes])
	    }, delayTime)
	  }
	}

节流

	/**
	 * 使用闭包封装节流函数
	 * @param {*} Callback 
	 * @param {*} delayTime 
	 * @returns 
	 */
	export const throttleEvent = (Callback, delayTime) => {
	  // 上一次执行的时间，
	  let constTime = 0
	  // 可以认为是节流的阀门。
	  let valve = false
	  return function (...agmes) {
	    let createTime = new Date().getTime()
	    let day = (createTime - constTime) / 1000
	    valve = !constTime || day > delayTime ? true : false
	    if (valve) {
	      Callback.apply(this, [...agmes])
	      constTime = createTime
	    }
	  }
	}

多维数组扁平化

	/**
	 * 多维数组扁平化
	 * @param {*} arr 
	 * @returns 
	 */
	export const arrDelayering = (arr) => {
	  if (!Array.isArray(arr)) return []
	  let newarr = new Array()
	  arr.forEach(item => Array.isArray(item) ? newarr = newarr.concat(arrpnh(item)) : newarr.push(item));
	  return newarr
	}

数组转tree

	/**
	 * 数组转tree
	 * @param {*} arr 
	 * @param {*} nodeid 
	 * @returns 
	 */
	export const toTree = (arr,pid='pid',nodeid=null)=>{
	  if(!Array.isArray(arr))return []
	  let newarr = new Array()
	  arr.forEach(item => item[pid]===nodeid && newarr.push({...item,children:toTree(arr,pid,item.id)}));
	  return newarr
	}

tree转数组(递归)

	/**
	 * tree转数组 递归法 --转为数组后会按树形的顺序排序
	 * @param {*} data 
	 * @returns 
	 */
	export const treeArrdg = (data)=>{
	  let newarr = new Array()
	  data.forEach((item) => {
	    if (!item instanceof Object) return []
	    if (item.children && item.children.length) {
	      let children = item.children
	      delete item.children
	      newarr.push(item)
	      newarr = newarr.concat(treeArrdg(children))
	    } else {
	      newarr.push(item)
	    }
	  })
	  return newarr
	}
	
	/**
	 * tree转数组 非递归法-- 会按树形结构排序，先进2先出 
	 * @param {*} data 
	 * @returns 
	 */
	export const treeArr = (data)=>{
	  if (!Array.isArray(data) || !data.length) return []
	  for (let i = 0; i < data.length; i++) {
	    let item = data[i]
	    if (item.children && item.children.length) {
	      data = data.concat(item.children)
	      delete item.children
	    }
	  }
	  return data
	}

tree转数组(循环)

	/**
	 * tree转数组 非递归法-- 会按树形结构排序，先进先出
	 * @param {*} data
	 * @returns
	 */
	export const treeArr = (data) => {
	  if (!Array.isArray(data) || !data.length) return []
	  for (let i = 0; i < data.length; i++) {
	    let item = data[i]
	    if (item.children && item.children.length) {
	      data = data.concat(item.children)
	      delete item.children
	    }
	  }
	  return data
	}

Base64加密解密

/**
 * Base64加密解密
 * 构造函数-需要new创建实例
 */

export const Base64 = function () {
  // private property
  var _keyStr =
    'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/='

  // public method for encoding
  this.encode = function (input) {
    if (typeof input == 'object') {
      input = JSON.stringify(input)
    }
    input = input + ''
    var output = ''
    var chr1, chr2, chr3, enc1, enc2, enc3, enc4
    var i = 0
    input = _utf8_encode(input)
    while (i < input.length) {
      chr1 = input.charCodeAt(i++)
      chr2 = input.charCodeAt(i++)
      chr3 = input.charCodeAt(i++)
      enc1 = chr1 >> 2
      enc2 = ((chr1 & 3) << 4) | (chr2 >> 4)
      enc3 = ((chr2 & 15) << 2) | (chr3 >> 6)
      enc4 = chr3 & 63
      if (isNaN(chr2)) {
        enc3 = enc4 = 64
      } else if (isNaN(chr3)) {
        enc4 = 64
      }
      output =
        output +
        _keyStr.charAt(enc1) +
        _keyStr.charAt(enc2) +
        _keyStr.charAt(enc3) +
        _keyStr.charAt(enc4)
    }
    return output
  }

  // public method for decoding
  this.decode = function (input) {
    var output = ''
    var chr1, chr2, chr3
    var enc1, enc2, enc3, enc4
    var i = 0
    input = input.replace(/[^A-Za-z0-9\+\/\=]/g, '')
    while (i < input.length) {
      enc1 = _keyStr.indexOf(input.charAt(i++))
      enc2 = _keyStr.indexOf(input.charAt(i++))
      enc3 = _keyStr.indexOf(input.charAt(i++))
      enc4 = _keyStr.indexOf(input.charAt(i++))
      chr1 = (enc1 << 2) | (enc2 >> 4)
      chr2 = ((enc2 & 15) << 4) | (enc3 >> 2)
      chr3 = ((enc3 & 3) << 6) | enc4
      output = output + String.fromCharCode(chr1)
      if (enc3 != 64) {
        output = output + String.fromCharCode(chr2)
      }
      if (enc4 != 64) {
        output = output + String.fromCharCode(chr3)
      }
    }
    output = _utf8_decode(output)
    return output
  }

  // private method for UTF-8 encoding
  var _utf8_encode = function (string) {
    string = string.replace(/\r\n/g, '\n')
    var utftext = ''
    for (var n = 0; n < string.length; n++) {
      var c = string.charCodeAt(n)
      if (c < 128) {
        utftext += String.fromCharCode(c)
      } else if (c > 127 && c < 2048) {
        utftext += String.fromCharCode((c >> 6) | 192)
        utftext += String.fromCharCode((c & 63) | 128)
      } else {
        utftext += String.fromCharCode((c >> 12) | 224)
        utftext += String.fromCharCode(((c >> 6) & 63) | 128)
        utftext += String.fromCharCode((c & 63) | 128)
      }
    }
    return utftext
  }

  // private method for UTF-8 decoding
  var _utf8_decode = function (utftext) {
    var string = ''
    var i = 0
    var c = 0,
      c1 = 0,
      c2 = 0
    while (i < utftext.length) {
      c = utftext.charCodeAt(i)
      if (c < 128) {
        string += String.fromCharCode(c)
        i++
      } else if (c > 191 && c < 224) {
        c2 = utftext.charCodeAt(i + 1)
        string += String.fromCharCode(((c & 31) << 6) | (c2 & 63))
        i += 2
      } else {
        c2 = utftext.charCodeAt(i + 1)
        c3 = utftext.charCodeAt(i + 2)
        string += String.fromCharCode(
          ((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63)
        )
        i += 3
      }
    }
    return string
  }
}

判断当前设备是否属于移动端

/**
 * 判断当前设备是否属于移动端
 * @returns bool|object
 */
export const equipmentType = ()=>{
  var UA = window.navigator.userAgent.toLowerCase()
  var isAndroid = UA.indexOf('android') > 0
  var isIOS = /iphone|ipad|ipod|ios/.test(UA)
  if (isAndroid || isIOS) {
    return {
      isPhone: isAndroid || isIOS,
      isAndroid,
      isIOS,
    }
  } else {
    return false
  }
}

手机号加敏

/**
 * 手机号加敏
 * @param {手机号} str 
 * @returns string
 */
export const phoneDesion = (str='')=>{
  str+=''
  return str.replace(/(\d{3})\d{4}(\d{4})/, '$1****$2')
}

身份证加敏

/**
 * 身份证加敏
 * @param {身份证号} str 
 * @returns string
 */
export const codeDesion = (str='')=>{
  str+=''
  return str.replace(/^(.{6})(?:\d+)(.{4})$/, '$1********$2')
}

获取某月共有多少天

/**
 * 获取某月共有多少天-不传参数就是获取当月
 * @param year 年份
 * @param month 月份
 */
export function getMonthDayNum(year,month){
  let date = null
  if(year && month){
    date = new Date(year,month,0)
  }else{
    const d = new Date()
    date = new Date(d.getFullYear(),d.getMonth()+1,0)
  }
  return date.getDate()
}

处理+ - * / 运算精度丢失

/**
 * 解决js计算的精度问题
 */
const fn = {
  countDecimals(num) {
    let len = 0
    try {
      num = Number(num)
      let str = num.toString().toUpperCase()
      if (str.split('E').length === 2) { // scientific notation
        let isDecimal = false
        if (str.split('.').length === 2) {
          str = str.split('.')[1]
          if (parseInt(str.split('E')[0]) !== 0) {
            isDecimal = true
          }
        }
        let x = str.split('E')
        if (isDecimal) {
          len = x[0].length
        }
        len -= parseInt(x[1])
      } else if (str.split('.').length === 2) { // decimal
        if (parseInt(str.split('.')[1]) !== 0) {
          len = str.split('.')[1].length
        }
      }
    } catch (e) {
      throw e
    } finally {
      if (isNaN(len) || len < 0) {
        len = 0
      }
      // eslint-disable-next-line no-unsafe-finally
      return len
    }
  },
  convertToInt(num) {
    num = Number(num)
    let newNum = num
    let times = this.countDecimals(num)
    let tempNum = num.toString().toUpperCase()
    if (tempNum.split('E').length === 2) {
      newNum = Math.round(num * Math.pow(10, times))
    } else {
      newNum = Number(tempNum.replace('.', ''))
    }
    return newNum
  },
  getCorrectResult(type, num1, num2, result) {
    let tempResult = 0
    switch (type) {
      case 'add':
        tempResult = num1 + num2
        break
      case 'sub':
        tempResult = num1 - num2
        break
      case 'div':
        tempResult = num1 / num2
        break
      case 'mul':
        tempResult = num1 * num2
        break
    }
    if (Math.abs(result - tempResult) > 1) {
      return Number(tempResult)
    }
    return Number(result)
  }
}

const calculation = {
  // 加法
  add(num1, num2) {
    num1 = Number(num1)
    num2 = Number(num2)
    let dec1, dec2, times
    try { dec1 = fn.countDecimals(num1) + 1 } catch (e) { dec1 = 0 }
    try { dec2 = fn.countDecimals(num2) + 1 } catch (e) { dec2 = 0 }
    times = Math.pow(10, Math.max(dec1, dec2))
    // let result = (num1 * times + num2 * times) / times
    let result = (this.mul(num1, times) + this.mul(num2, times)) / times
    return fn.getCorrectResult('add', num1, num2, result)
    // return result
  },
  // 减法
  sub(num1, num2) {
    num1 = Number(num1)
    num2 = Number(num2)
    let dec1, dec2, times
    try { dec1 = fn.countDecimals(num1) + 1 } catch (e) { dec1 = 0 }
    try { dec2 = fn.countDecimals(num2) + 1 } catch (e) { dec2 = 0 }
    times = Math.pow(10, Math.max(dec1, dec2))
    // let result = Number(((num1 * times - num2 * times) / times)
    let result = Number((this.mul(num1, times) - this.mul(num2, times)) / times)
    return fn.getCorrectResult('sub', num1, num2, result)
    // return result
  },
  // 乘法
  mul(num1, num2) {
    num1 = Number(num1)
    num2 = Number(num2)
    let times = 0
    let s1 = num1.toString()
    let s2 = num2.toString()
    try { times += fn.countDecimals(s1) } catch (e) { }
    try { times += fn.countDecimals(s2) } catch (e) { }
    let result = fn.convertToInt(s1) * fn.convertToInt(s2) / Math.pow(10, times)
    return fn.getCorrectResult('mul', num1, num2, result)
    // return result
  },
  // 除法
  div(num1, num2) {
    num1 = Number(num1)
    num2 = Number(num2)
    let t1 = 0
    let t2 = 0
    let dec1, dec2
    try { t1 = fn.countDecimals(num1) } catch (e) { }
    try { t2 = fn.countDecimals(num2) } catch (e) { }
    dec1 = fn.convertToInt(num1)
    dec2 = fn.convertToInt(num2)
    let result = this.mul((dec1 / dec2), Math.pow(10, t2 - t1))
    return fn.getCorrectResult('div', num1, num2, result)
    // return result
  }
}

export default calculation

内容复制

/**
 * 
 * @param {string} text 
 * @param {string} msg 
 */
export async function cloneText(text,msg){
  try {
    // 在非https下不支持
    if(navigator.clipboard && window.isSecureContext) {
      const clipboardObj = navigator.clipboard
      await clipboardObj.writeText(text)
      ElMessage.success(msg || '复制成功')
    }else{
      let textArea = document.createElement("textarea");
      textArea.value = text;
      textArea.style.position = "absolute";
      textArea.style.opacity = '0';
      textArea.style.left = "-999999px";
      textArea.style.top = "-999999px";
      document.body.appendChild(textArea);
      textArea.focus();
      textArea.select();
      document.execCommand('copy') ? ElMessage.success(msg || '复制成功') : ElMessage.warning('复制失败')
      textArea.remove();
    }
  } catch (error) {
    ElMessage.warning('复制失败')
  }
}

H5环境判断(判断是微信/支付宝/云闪付)

export function equipmentType() {
		var UA = window.navigator.userAgent.toLowerCase();
		var isAndroid = UA.indexOf('android') > 0;
		var isIOS = /iphone|ipad|ipod|ios/.test(UA);
		if (isAndroid || isIOS) {
			const obj = {
				isPhone: isAndroid || isIOS,
				isAndroid,
				isIOS,
				// 微信环境
				isWechat:UA.match(/MicroMessenger/i) == 'micromessenger',
				// 支付宝环境
				isAli:UA.match(/AlipayClient/i) == 'alipayclient',
				// 云闪付环境
				isYun:UA.match(/com.unionpay.chsp/i) == 'com.unionpay.chsp' || UA.match(/com.unionpay.mobilepay/i) == 'com.unionpay.mobilepay'
			}
			return obj
		} else {
			return false
		}
	}

从身份证中提取出生日

/**
 * 从身份证中提取出生日
 * @param value 身份证号码
 * @returns String 
*/
export function getBirthday(value){
	let reg = /(^\d{15}$)|(^\d{18}$)|(^\d{17}(\d|X|x)$)/;
	let birthday = '';
	value = value.toString()
	if (reg.test(value)) {
	  let data = value.slice(6, 14);
	  let y = data.slice(0, 4);
	  let m = data.slice(4, 6);
	  let d = data.slice(6, 8);
	  birthday = y + '-' + m + '-' + d;
	}
	return birthday
}

获取小程序状态栏及右上角胶囊位置信息(uni)

/**
 * 获取小程序状态栏及右上角胶囊位置信息
 * @returns {Object} 返回参数
 * @returns {Number} Object.statusBarHeight 状态栏高度
 */
export function getNavWHdata(){
	let obj = {}
	// 获取手机系统信息
	const info = uni.getSystemInfoSync()
	// 设置状态栏高度（H5顶部无状态栏小程序有状态栏需要撑起高度）
	obj.statusBarHeight = info.statusBarHeight
	obj.windowWidth = info.windowWidth
	
	// 获取胶囊的位置
	const menuButtonInfo = uni.getMenuButtonBoundingClientRect()
	// (胶囊底部高度 - 状态栏的高度) + (胶囊顶部高度 - 状态栏内的高度) = 导航栏的高度
	obj.navBarHeight = (menuButtonInfo.bottom - info.statusBarHeight) + (menuButtonInfo.top - info
		.statusBarHeight)
	// 导航宽度等于出左上角菜单按钮宽度
	obj.windowWidth = menuButtonInfo.left
	obj.navHeight = obj.navBarHeight + obj.statusBarHeight
	return obj
}

平滑的滚动到页面指定位置

Math.easeInOutQuad = function (t, b, c, d) {
  t /= d / 2;
  if (t < 1) {
    return (c / 2) * t * t + b;
  }
  t--;
  return (-c / 2) * (t * (t - 2) - 1) + b;
};

// requestAnimationFrame for Smart Animating http://goo.gl/sx5sts
var requestAnimFrame = (function () {
  return (
    window.requestAnimationFrame ||
    window.webkitRequestAnimationFrame ||
    window.mozRequestAnimationFrame ||
    function (callback) {
      window.setTimeout(callback, 1000 / 60);
    }
  );
})();

/**
 * Because it's so fucking difficult to detect the scrolling element, just move them all
 * @param {number} amount
 */
function move(amount) {
  document.documentElement.scrollTop = amount;
  document.body.parentNode.scrollTop = amount;
  document.body.scrollTop = amount;
}

function position() {
  return document.documentElement.scrollTop || document.body.parentNode.scrollTop || document.body.scrollTop;
}

/**
 * @param {number} to
 * @param {number} duration
 * @param {Function} callback
 */
export function scrollTo(to, duration, callback) {
  const start = position();
  const change = to - start;
  const increment = 20;
  let currentTime = 0;
  duration = typeof duration === 'undefined' ? 500 : duration;
  var animateScroll = function () {
    // increment the time
    currentTime += increment;
    // find the value with the quadratic in-out easing function
    var val = Math.easeInOutQuad(currentTime, start, change, duration);
    // move the document.body
    move(val);
    // do the animation unless its over
    if (currentTime < duration) {
      requestAnimFrame(animateScroll);
    } else {
      if (callback && typeof callback === 'function') {
        // the animation is done so lets callback
        callback();
      }
    }
  };
  animateScroll();
}

深度合并对象

 // 深度合并对象
  function deepAssign(obj1, obj2) {
    for (let key in obj2) {
      obj1[key] = obj1[key] && obj1[key].toString() === "[object Object]" ?
        deepAssign(obj1[key], obj2[key]) : obj1[key] = obj2[key];
    }
    return obj1;
  }

canvas绘制星空背景(星星会动)

export default function initLoginBg() {
  var windowWidth = document.documentElement.clientWidth || document.body.clientWidth;
  var windowHeight = document.documentElement.clientHeight || document.body.clientHeight;
  // var windowWidth = window.clientWidth;
  // var windowHeight = window.clientHeight;
  var canvas = document.getElementById('canvas'),
    ctx = canvas.getContext('2d'),
    w = canvas.width = windowWidth,
    h = canvas.height = windowHeight,

    hue = 217,
    stars = [],
    count = 0,
    maxStars = 500;//星星数量

  var canvas2 = document.createElement('canvas'),
    ctx2 = canvas2.getContext('2d');
  canvas2.width = 120;
  canvas2.height = 120;
  var half = canvas2.width / 2,
    gradient2 = ctx2.createRadialGradient(half, half, 0, half, half, half);
  gradient2.addColorStop(0.025, '#CCC');
  gradient2.addColorStop(0.1, 'hsl(' + hue + ', 61%, 33%)');
  gradient2.addColorStop(0.25, 'hsl(' + hue + ', 64%, 6%)');
  gradient2.addColorStop(1, 'transparent');

  ctx2.fillStyle = gradient2;
  ctx2.beginPath();
  ctx2.arc(half, half, half, 0, Math.PI * 2);
  ctx2.fill();

  // End cache

  function random(min, max = 0) {
    if (arguments.length < 2) {
      max = min;
      min = 0;
    }

    if (min > max) {
      var hold = max;
      max = min;
      min = hold;
    }

    return Math.floor(Math.random() * (max - min + 1)) + min;
  }

  function maxOrbit(x, y) {
    var max = Math.max(x, y),
      diameter = Math.round(Math.sqrt(max * max + max * max));
    return diameter / 2;
    //星星移动范围，值越大范围越小，
  }
  var Star = function () {

    this.orbitRadius = random(maxOrbit(w, h));
    this.radius = random(60, this.orbitRadius) / 18;
    //星星大小
    this.orbitX = w / 2;
    this.orbitY = h / 2;
    this.timePassed = random(0, maxStars);
    this.speed = random(this.orbitRadius) / 500000;
    //星星移动速度
    this.alpha = random(2, 10) / 10;

    count++;
    stars[count] = this;
  }

  Star.prototype.draw = function () {
    var x = Math.sin(this.timePassed) * this.orbitRadius + this.orbitX,
      y = Math.cos(this.timePassed) * this.orbitRadius + this.orbitY,
      twinkle = random(10);

    if (twinkle === 1 && this.alpha > 0) {
      this.alpha -= 0.05;
    } else if (twinkle === 2 && this.alpha < 1) {
      this.alpha += 0.05;
    }

    ctx.globalAlpha = this.alpha;
    ctx.drawImage(canvas2, x - this.radius / 2, y - this.radius / 2, this.radius, this.radius);
    this.timePassed += this.speed;
  }

  for (var i = 0; i < maxStars; i++) {
    new Star.prototype.constructor();
  }

  function animation() {
    ctx.globalCompositeOperation = 'source-over';
    ctx.globalAlpha = 0.5; //尾巴
    ctx.fillStyle = 'hsla(' + hue + ', 64%, 6%, 2)';
    ctx.fillRect(0, 0, w, h)

    ctx.globalCompositeOperation = 'lighter';
    for (var i = 1, l = stars.length; i < l; i++) {
      stars[i].draw();
    };

    window.requestAnimationFrame(animation);
  }

  animation();
}

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