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JS 常用功能方法集合，持续会更新

/**
 *[获取URL中的参数名及参数值的集合]
 * 示例URL:http://htmlJsTest/getrequest.html?uid=admin&rid=1&fid=2&name=小明
 * @param {[string]} urlStr [当该参数不为空的时候，则解析该url中的参数集合]
 * @return {[string]}       [参数集合]
 */
export function GetRequest(urlStr) {
    if (typeof urlStr == "undefined") {
        var url = decodeURI(location.search); //获取url中"?"符后的字符串
    } else {
        var url = "?" + urlStr.split("?")[1];
    }
    var theRequest = new Object();
    if (url.indexOf("?") != -1) {
        var str = url.substr(1);
        let strs = str.split("&");
        for (var i = 0; i < strs.length; i++) {
            theRequest[strs[i].split("=")[0]] = decodeURI(strs[i].split("=")[1]);
        }
    }
    return theRequest;
}	


// 获取url中的参数
export function urlParamToObj(url, key) {
    var reg = /(?:\?|\&)([^=&?]+)=([^=&?]+)/g,
        res = {};
    url.replace(reg, function($, $1, $2) {
        res[$1] = decodeURIComponent($2);
    });
    if (key === void 0) return res;
    if (key in res) return res[key];
}


/**
 * @description 根据主键删除数组中的元素 123
 * 比如：deleteByKeys(fileList, 'uid', [file.uid]); file.uid当前文件的id 根据这个 id 删除数组中的这个
 * @param array 原数组
 * @param keyField 主键字段
 * @param keyValues 主键值
 */
export function deleteByKeys(array, keyField, keyValues) {
    if (!array || !keyField || !keyValues) return;
    if (!Array.isArray(keyValues)) keyValues = [keyValues];

    keyValues.forEach((item) => {
        const param = {};
        param[keyField] = item;

        let index = -1;
        do {
            index = getIndexByObject(array, param);
            if (index != -1) array.splice(index, 1);
        } while (index > -1);
    });
}

export function getIndexByObject(array, paramObject) {
    if (array == undefined || array == null) return -1;
    let equalFlag = false;
    let index = -1;

    for (let i = 0; i < array.length; i++) {
        equalFlag = true;
        const item = array[i];
        for (const property in paramObject) {
            if (item[property] != paramObject[property]) {
                equalFlag = false;
                break;
            }
        }

        if (equalFlag) {
            index = i;
            break;
        }
    }
    return index;
}


// 校验数据类型
export const typeOf = function(obj) {
  return Object.prototype.toString.call(obj).slice(8, -1).toLowerCase()
}


//防抖
export const debounce = (() => {
  let timer = null
  return (callback, wait = 800) => {
    timer&&clearTimeout(timer)
    timer = setTimeout(callback, wait)
  }
})()

//如 防抖vue 中使用
/**
methods: {
  loadList() {
    debounce(() => {
      console.log('加载数据')
    }, 500)
  }
}
*/


//节流
export const throttle = (() => {
  let last = 0
  return (callback, wait = 800) => {
    let now = +new Date()
    if (now - last > wait) {
      callback()
      last = now
    }
  }
})()


//判断数组是否为空
export function isEmpty(array) {
    return !array || (Array.isArray(array) && array.length == 0);
}



//银行卡 每四位中间加一个空格
export function bankRe(v) {
    if (/\S{5}/.test(v)) {
      return v.replace(/\s/g, '').replace(/(.{4})/g, "$1 ");
    }
}



// 隐藏银行卡中间号码包含空格 
export function hideBankCard(value){
  if (value && value.length > 8) {
    return `${value.substring(0, 4)} ${"*".repeat(value.length - 8).replace(/(.{4})/g, `$1 `)}${value.length % 4 ? " " : ""}${value.slice(-4)}`;
  }
  return value;
}
 
console.log(hideBankCard(6212261611110000222)) 
//打印结果 6212 **** **** *** 0222


// 隐藏银行卡中间号码不包含空格 
export function hideBankCard(value){
  if(value&&value.length>8) {
    let reg = /^(\d{4})(\d*)(\d{4})$/;
    let str = value.replace(reg, (a, b, c, d)=> {
      return b + c.replace(/\d/g, "*") + d;
    });
    return str
  }else {
    return value
  }
}
 
console.log(hideBankCard('6212261611110000222'));
//打印结果 6212***********0222


// 开启全屏
export const launchFullscreen = () => {
   //获取当前是否全屏展示
    let full = document.fullscreenElement;
    if (!full) {
        document.documentElement.requestFullscreen();
    } else {
        document.exitFullscreen();
    }
}


/**
* @description. [大小写转换]
* str 待转换的字符串
* type 1-全大写 2-全小写 3-首字母大写
*/
export const turnCase = (str, type) => {
  switch (type) {
    case 1:
      return str.toUpperCase()
    case 2:
      return str.toLowerCase()
    case 3:
      //return str[0].toUpperCase() + str.substr(1).toLowerCase() // substr 已不推荐使用
      return str[0].toUpperCase() + str.substring(1).toLowerCase()
    default:
      return str
  }
}



/** 
 *@description 判断手机是Andoird还是IOS
 * 1: ios
 * 2: android
 * 3: 其它
 */
export const getOSType=() => {
  let u = navigator.userAgent, app = navigator.appVersion;
  let isAndroid = u.indexOf('Android') > -1 || u.indexOf('Linux') > -1;
  let isIOS = !!u.match(/\(i[^;]+;( U;)? CPU.+Mac OS X/);
  if (isIOS) {
    return 1;
  }
  if (isAndroid) {
    return 2;
  }
  return 3;
}



// 数组去重
export const distinct = (arr = testArr) => {
   return arr.filter((v, i, array) => array.indexOf(v) === i)
}
var list = [1,1,2,3,3,2,1,2,31,12,31,2];
console.log(distinct(list));



/**
* @description 数组对象根据字段去重
* arr 要去重的数组
* key 根据去重的字段名
*/
export const uniqueArrayObject = (arr = [], key = 'id') => {
  if (arr.length === 0) return
  let list = []
  const map = {}
  arr.forEach((item) => {
    if (!map[item[key]]) {
      map[item[key]] = item
    }
  })
  list = Object.values(map)

  return list
}
// 示列  uniqueArrayObject(responseList, 'id')



// 滚动到页面顶部
export const scrollToTop = () => {
  const height = document.documentElement.scrollTop || document.body.scrollTop;
  if (height > 0) {
    window.requestAnimationFrame(scrollToTop);
    window.scrollTo(0, height - height / 8);
  }
}



//滚动到元素位置
export const smoothScroll = element =>{
    document.querySelector(element).scrollIntoView({
        behavior: 'smooth'
    });
};
// smoothScroll('#target'); // 平滑滚动到 ID 为 target 的元素



//uuid
export const uuid = () => {
  const temp_url = URL.createObjectURL(new Blob())
  const uuid = temp_url.toString()
  URL.revokeObjectURL(temp_url) //释放这个url
  return uuid.substring(uuid.lastIndexOf('/') + 1)
}
  


// 根据参数获取间隔年月日 123
//  获取间隔天数
export function getIntervalDate(n) {
    const dd = new Date();
    //  获取n天后的日期
    dd.setDate(dd.getDate() + n * 1);
    const year = dd.getFullYear();
    //  获取当前月份的日期，不足10补0
    const mon =
        dd.getMonth() + 1 < 10 ? `0${dd.getMonth() + 1}` : dd.getMonth() + 1;
    //  获取当前几号，不足10补0
    const day = dd.getDate() < 10 ? `0${dd.getDate()}` : dd.getDate();
    const _date = `${year}-${mon}-${day}`;
    return _date;
}



//数字转换为大写中文
export function digitUppercase(money) {
    //汉字的数字
    var cnNums = new Array('零', '壹', '贰', '叁', '肆', '伍', '陆', '柒', '捌', '玖');
    //基本单位
    var cnIntRadice = new Array('', '拾', '佰', '仟');
    //对应整数部分扩展单位
    var cnIntUnits = new Array('', '万', '亿', '兆');
    //对应小数部分单位
    var cnDecUnits = new Array('角', '分', '毫', '厘');
    //整数金额时后面跟的字符
    var cnInteger = '整';
    //整型完以后的单位
    var cnIntLast = '元';
    //最大处理的数字
    var maxNum = 999999999999999.9999;
    //金额整数部分
    var integerNum;
    //金额小数部分
    var decimalNum;
    //输出的中文金额字符串
    var chineseStr = '';
    //分离金额后用的数组，预定义
    var parts;
    if (money == '') { return ''; }
    money = parseFloat(money);
    if (money >= maxNum) {
        //超出最大处理数字
        return '';
    }
    if (money == 0) {
        chineseStr = cnNums[0] + cnIntLast + cnInteger;
        return chineseStr;
    }
    //转换为字符串
    money = money.toString();
    if (money.indexOf('.') == -1) {
        integerNum = money;
        decimalNum = '';
    } else {
        parts = money.split('.');
        integerNum = parts[0];
        decimalNum = parts[1].substr(0, 4);
    }
    //获取整型部分转换
    if (parseInt(integerNum, 10) > 0) {
        var zeroCount = 0;
        var IntLen = integerNum.length;
        for (var i = 0; i < IntLen; i++) {
            var n = integerNum.substr(i, 1);
            var p = IntLen - i - 1;
            var q = p / 4;
            var m = p % 4;
            if (n == '0') {
                zeroCount++;
            } else {
                if (zeroCount > 0) {
                    chineseStr += cnNums[0];
                }
                //归零
                zeroCount = 0;
                chineseStr += cnNums[parseInt(n)] + cnIntRadice[m];
            }
            if (m == 0 && zeroCount < 4) {
                chineseStr += cnIntUnits[q];
            }
        }
        chineseStr += cnIntLast;
    }
    //小数部分
    if (decimalNum != '') {
        var decLen = decimalNum.length;
        for (var i = 0; i < decLen; i++) {
            var n = decimalNum.substr(i, 1);
            if (n != '0') {
                chineseStr += cnNums[Number(n)] + cnDecUnits[i];
            }
        }
    }
    if (chineseStr == '') {
        chineseStr += cnNums[0] + cnIntLast + cnInteger;
    } else if (decimalNum == '') {
        chineseStr += cnInteger;
    }
    return chineseStr;
}


//

/**
*@description [金额格式化]
*{number} number：要格式化的数字
*{number} decimals：保留几位小数
*{string} dec_point：小数点符号
*{number} number：要格式化的数字
*{string} thousands_sep：千分位符号
*/

export const moneyFormat = (number, decimals, dec_point, thousands_sep) => {
  number = (number + '').replace(/[^0-9+-Ee.]/g, '')
  const n = !isFinite(+number) ? 0 : +number
  const prec = !isFinite(+decimals) ? 2 : Math.abs(decimals)
  const sep = typeof thousands_sep === 'undefined' ? ',' : thousands_sep
  const dec = typeof dec_point === 'undefined' ? '.' : dec_point
  let s = ''
  const toFixedFix = function(n, prec) {
    const k = Math.pow(10, prec)
    return '' + Math.ceil(n * k) / k
  }
  s = (prec ? toFixedFix(n, prec) : '' + Math.round(n)).split('.')
  const re = /(-?\d+)(\d{3})/
  while (re.test(s[0])) {
    s[0] = s[0].replace(re, '$1' + sep + '$2')
  }

  if ((s[1] || '').length < prec) {
    s[1] = s[1] || ''
    s[1] += new Array(prec - s[1].length + 1).join('0')
  }
  return s.join(dec)
}


// 增加千位符
export function toThousands(num) {
    if (num) {
        var str = num.toString()
        var reg = str.indexOf('.') > -1 ? /(\d)(?=(\d{3})+\.)/g : /(\d)(?=(?:\d{3})+$)/g
        return str.replace(reg, '$1,')
    } else {
        return num
    }
}

/**
 * 截取指定字节的字符串
 * @param str 要截取的字符穿
 * @param len 要截取的长度，根据字节计算
 * @param suffix 截取前len个后，其余的字符的替换字符，一般用“…”
 * @returns {*}
 */
export function cutString(str, len, suffix) {
  if (!str) return "";
  if (len <= 0) return "";
  if (!suffix) suffix = "";
  var templen = 0;
  for (var i = 0; i < str.length; i++) {
    if (str.charCodeAt(i) > 255) {
      templen += 2;
    } else {
      templen++
    }
    if (templen == len) {
      return str.substring(0, i + 1) + suffix;
    } else if (templen > len) {
      return str.substring(0, i) + suffix;
    }
  }
  return str;
}


// 表单校验手机号码
export function checkPhone(rule, value, callback) {
    if (/^1[0-9]{10}$/.test(value)) {
        callback() 
    } else {
        callback(new Error('请输入正确的11位手机号码'))
    }
}


// 手机号中间四位显示 * 号
export function hideMobile(mobile) {
   return mobile.replace(/^(\d{3})\d{4}(\d{4})$/, "$1****$2")
}
// hideMobile('14456565656')


// 表单校验身份证号码
export function checkIdentity(rule, value, callback) {
    if (/(^\d{15}$)|(^\d{18}$)|(^\d{17}(\d|X|x)$)/.test(value)) {
        callback() 
    } else {
        callback(new Error('请输入正确的身份证号码'))
    }
}

// 表单验证邮箱
export function checkEmil(rule, value, callback) {
    if (/^[A-Za-z\d]+([-_.][A-Za-z\d]+)*@([A-Za-z\d]+[-.])+[A-Za-z\d]{2,4}$/.test(value)) {
        callback()
    } else {
        callback(new Error('请输入正确的邮箱'))
    }
}


// 计算表格List某个字段Number总和
 //比如：calculateListSum(this.ruleForm.detailList, 'regionIncome', 2)
export function calculateListSum(array, field, fixedNum) {
    if (!(array && array.length)) return Number(0).toFixed(fixedNum)
    else {
        const result = (array.reduce((pre, current) => pre + Number(current[field] || 0), 0)).toFixed(fixedNum)
        return result
    }
}


// 校验表格List某个字段是否重复
export function checkDuplicate(list, field) {
    let map = new Map()
    for (let i = 0; i < list.length; i++) {
        if (map.has(list[i][field])) {
            return true
        } else {
            map.set(list[i][field], i)
            if (map.size == list.length) {
                return false
            }
        }
    }
}


/**
 * @description 根据value值进行list对应的枚举转换
 * @param list 枚举数组
 * @param value 目标value值
 * @param keyField 主键字段
 * 比如 getEnumTextByList(typeOptions, record.type, "label")
**/
export function getEnumTextByList(list, value, keyField) {
    let result = list.find(item => item.value == value)
    return result && result[keyField]
}


//存储操作
class MyCache {
  constructor(isLocal = true) {
    this.storage = isLocal ? localStorage : sessionStorage
  }

  setItem(key, value) {
    if (typeof (value) === 'object') value = JSON.stringify(value)
    this.storage.setItem(key, value)
  }

  getItem(key) {
    try {
      return JSON.parse(this.storage.getItem(key))
    } catch (err) {
      return this.storage.getItem(key)
    }
  }

  removeItem(key) {
    this.storage.removeItem(key)
  }

  clear() {
    this.storage.clear()
  }

  key(index) {
    return this.storage.key(index)
  }

  length() {
    return this.storage.length
  }
}

const localCache = new MyCache()
const sessionCache = new MyCache(false)

export { localCache, sessionCache }
//示例
// localCache.getItem('user')
// sessionCache.setItem('name','树哥')
// sessionCache.getItem('token')
// localCache.clear()



/**
* @description. 下载文件
* api 接口
* params 请求参数
* fileName 文件名
*/
const downloadFile = (api, params, fileName, type = 'get') => {
  axios({
    method: type,
    url: api,
    responseType: 'blob', 
    params: params
  }).then((res) => {
    let str = res.headers['content-disposition']
    if (!res || !str) {
      return
    }
    let suffix = ''
    // 截取文件名和文件类型
    if (str.lastIndexOf('.')) {
      fileName ? '' : fileName = decodeURI(str.substring(str.indexOf('=') + 1, str.lastIndexOf('.')))
      suffix = str.substring(str.lastIndexOf('.'), str.length)
    }
    //  如果支持微软的文件下载方式(ie10+浏览器)
    if (window.navigator.msSaveBlob) {
      try {
        const blobObject = new Blob([res.data]);
        window.navigator.msSaveBlob(blobObject, fileName + suffix);
      } catch (e) {
        console.log(e);
      }
    } else {
      //  其他浏览器
      let url = window.URL.createObjectURL(res.data)
      let link = document.createElement('a')
      link.style.display = 'none'
      link.href = url
      link.setAttribute('download', fileName + suffix)
      document.body.appendChild(link)
      link.click()
      document.body.removeChild(link)
      window.URL.revokeObjectURL(link.href);
    }
  }).catch((err) => {
    console.log(err.message);
  })
}
// 示例： downloadFile('/api/download', {id}, '文件名')




// 遍历树节点
export const foreachTree = (data, callback, childrenName = 'children') => {
  for (let i = 0; i < data.length; i++) {
    callback(data[i])
    if (data[i][childrenName] && data[i][childrenName].length > 0) {
      foreachTree(data[i][childrenName], callback, childrenName)
    }
  }
}

/** 示例：假设我们要从树状结构数据中查找 id 为 9 的节点
const data = [{
  id: 1,
  label: '一级 1',
  children: [{
    id: 4,
    label: '二级 1-1',
    children: [{
      id: 9,
      label: '三级 1-1-1'
    }, {
      id: 10,
      label: '三级 1-1-2'
    }]
  }]
 }, {
  id: 2,
  label: '一级 2',
  children: [{
    id: 5,
    label: '二级 2-1'
  }, {
    id: 6,
    label: '二级 2-2'
  }]
  }, {
    id: 3,
    label: '一级 3',
    children: [{
      id: 7,
      label: '二级 3-1'
    }, {
      id: 8,
      label: '二级 3-2'
    }]
}],

let result
foreachTree(data, (item) => {
  if (item.id === 9) {
    result = item
  }
})
console.log('result', result)  // {id: 9,label: "三级 1-1-1"} 
*/

后面会持续更新
如有不足之处请指出 或直接联系邮箱 [email protected] 谢谢