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复制

javascript
function copy(data) {
  if (!data) return;
  const url = data;
  const oInput = document.createElement("input");
  oInput.value = url;
  document.body.appendChild(oInput);
  oInput.select(); // 选择对象;
  document.execCommand("Copy"); // 执行浏览器复制命令
  oInput.remove();
}

递归处理节点

数组转树

typescript
const routes = [
  { id: 1, name: '爷爷', pid: 0 },
  { id: 2, name: '爸爸', pid: 1 },
  { id: 3, name: '儿子', pid: 2 },
  { id: 4, name: '老大爷', pid: 0 },
  { id: 5, name: '老太婆', pid: 0 },
];

function genRoute(arr) {
  let pArr = arr.filter((item) => item.pid == 0),
    cArr = arr.filter((item) => item.pid !== 0);
  function data2Tree(pArr, cArr) {
    pArr.map((p) => {
      cArr.map((c, i) => {
        if (c.pid === p.id) {
          p.children = p.children || [];
          let _c = JSON.parse(JSON.stringify(cArr));
          _c.splice(i, 1);
          data2Tree([c], _c);
          p.children = [...p.children, c];
        }
      });
    });
  }
  data2Tree(pArr, cArr);
  return pArr;
}
genRoute(routes);

deepClone

image.png

20个 工具函数

javascript
1、校验数据类型
export const typeOf = function(obj) {
  return Object.prototype.toString.call(obj).slice(8, -1).toLowerCase()
}
2、防抖
export const debounce = (() => {
  let timer = null
  return (callback, wait = 800) => {
    timer&&clearTimeout(timer)
    timer = setTimeout(callback, wait)
  }
})()
3、节流
export const throttle = (() => {
  let last = 0
  return (callback, wait = 800) => {
    let now = +new Date()
    if (now - last > wait) {
      callback()
      last = now
    }
  }
})()
4、手机号脱敏
export const hideMobile = (mobile) => {
  return mobile.replace(/^(\d{3})\d{4}(\d{4})$/, "$1****$2")
}

5、开启全屏
export const launchFullscreen = (element) => {
  if (element.requestFullscreen) {
    element.requestFullscreen()
  } else if (element.mozRequestFullScreen) {
    element.mozRequestFullScreen()
  } else if (element.msRequestFullscreen) {
    element.msRequestFullscreen()
  } else if (element.webkitRequestFullscreen) {
    element.webkitRequestFullScreen()
  }
}
6、关闭全屏
export const exitFullscreen = () => {
  if (document.exitFullscreen) {
    document.exitFullscreen()
  } else if (document.msExitFullscreen) {
    document.msExitFullscreen()
  } else if (document.mozCancelFullScreen) {
    document.mozCancelFullScreen()
  } else if (document.webkitExitFullscreen) {
    document.webkitExitFullscreen()
  }
}
7、大小写转换
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
  }
}
8、解析URL参数
export const getSearchParams = () => {
  const searchPar = new URLSearchParams(window.location.search)
  const paramsObj = {}
  for (const [key, value] of searchPar.entries()) {
    paramsObj[key] = value
  }
  return paramsObj
}
// 假设目前位于 https://****com/index?id=154513&age=18;
getSearchParams(); // {id: "154513", age: "18"}

9、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;
}
10、数组对象根据字段去重
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
}
11、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);
  }
}
12、滚动到元素位置
export const smoothScroll = element =>{
    document.querySelector(element).scrollIntoView({
        behavior: 'smooth'
    });
};
13、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)
}
uuid() // a640be34-689f-4b98-be77-e3972f9bffdd
14、金额格式化
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)
}
moneyFormat(10000000) // 10,000,000.00
moneyFormat(10000000, 3, '.', '-') // 10-000-000.000
15、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 }
localCache.getItem('user')
sessionCache.setItem('name','树哥')
sessionCache.getItem('token')
localCache.clear()
16、下载文件
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);
  })
}
downloadFile('/api/download', {id}, '文件名')
17、时间操作
强烈推荐使用 day.js
18、深拷贝
//此方法存在一定局限性：一些特殊情况没有处理: 例如Buffer对象、Promise、Set、Map。
//如果确实想要完备的深拷贝，推荐使用 lodash 中的 cloneDeep 方法。
export const clone = parent => {
  // 判断类型
  const isType = (obj, type) => {
    if (typeof obj !== "object") return false;
    const typeString = Object.prototype.toString.call(obj);
    let flag;
    switch (type) {
      case "Array":
        flag = typeString === "[object Array]";
        break;
      case "Date":
        flag = typeString === "[object Date]";
        break;
      case "RegExp":
        flag = typeString === "[object RegExp]";
        break;
      default:
        flag = false;
    }
    return flag;
  };

  // 处理正则
  const getRegExp = re => {
    var flags = "";
    if (re.global) flags += "g";
    if (re.ignoreCase) flags += "i";
    if (re.multiline) flags += "m";
    return flags;
  };
  // 维护两个储存循环引用的数组
  const parents = [];
  const children = [];

  const _clone = parent => {
    if (parent === null) return null;
    if (typeof parent !== "object") return parent;

    let child, proto;

    if (isType(parent, "Array")) {
      // 对数组做特殊处理
      child = [];
    } else if (isType(parent, "RegExp")) {
      // 对正则对象做特殊处理
      child = new RegExp(parent.source, getRegExp(parent));
      if (parent.lastIndex) child.lastIndex = parent.lastIndex;
    } else if (isType(parent, "Date")) {
      // 对Date对象做特殊处理
      child = new Date(parent.getTime());
    } else {
      // 处理对象原型
      proto = Object.getPrototypeOf(parent);
      // 利用Object.create切断原型链
      child = Object.create(proto);
    }

    // 处理循环引用
    const index = parents.indexOf(parent);

    if (index != -1) {
      // 如果父数组存在本对象,说明之前已经被引用过,直接返回此对象
      return children[index];
    }
    parents.push(parent);
    children.push(child);

    for (let i in parent) {
      // 递归
      child[i] = _clone(parent[i]);
    }

    return child;
  };
  return _clone(parent);
};

19、模糊搜索
list 原数组
keyWord 查询的关键词
attribute 数组需要检索属性
export const fuzzyQuery = (list, keyWord, attribute = 'name') => {
  const reg = new RegExp(keyWord)
  const arr = []
  for (let i = 0; i < list.length; i++) {
    if (reg.test(list[i][attribute])) {
      arr.push(list[i])
    }
  }
  return arr
}
20、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)
    }
  }
}
const treeData = [{
  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"}

测试外网内网

javascript
// 当前vue项目，所以没有使用jquery、ajax。而使用原生httpRequest
let that = this
// 第一步：建立所需的对象
var httpRequest = new XMLHttpRequest()
// 第二步，获取一个公网链接，可以是你原本要访问的地址
httpRequest.open('GET', 'https://lbs.netease.im/lbs/webconf.jsp', true)
// 第三步，设置响应超时时间
httpRequest.timeout = 3000

// 请求成功，使用公网方式
httpRequest.onload = function () {
  // 请求完成。在此进行处理。
  if (httpRequest.readyState === 4 && httpRequest.status === 200) {
    param.isPublic = true
    that.initIMByType(param)
  }
}
// 响应超时，使用内网方式
httpRequest.ontimeout = function (e) {
  // XMLHttpRequest 超时。在此做某事。
  param.isPublic = false
  that.initIMByType(param)
}

// 第四步：发送请求
httpRequest.send()

服务端获取ip

javascript
let os = require("os")

function getNetworkIp() {
    let needHost = "" // 打开的host
    try {
        // 获得网络接口列表
        let network = os.networkInterfaces()
        for (let dev in network) {
            let iface = network[dev]
            for (let i = 0; i < iface.length; i++) {
                let alias = iface[i]
                if (alias.family === "IPv4" && alias.address !== "127.0.0.1" && !alias.internal) {
                    needHost = alias.address
                }
            }
        }
    } catch (e) {
        needHost = "localhost"
    }
    return needHost
}
function getHost() {
    let host = ""
    let ifaces = os.networkInterfaces()
    out: for (var i in ifaces) {
        for (var j in ifaces[i]) {
            var val = ifaces[i][j]
            if (val.family === "IPv4" && val.address !== "127.0.0.1") {
                host = val.address
                break out
            }
        }
    }
    return host
}

图片颜色相近计算

javascript
function diff(color1,color3){
  return (
    Math.abs(color1[0]-color2[0])
    +Math.abs(color1[1]-color2[1])
    +Math.abs(color1[2]-color2[2])
    +Math.abs(color1[3]-color2[3])
  )
}

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