56个JavaScript 实用工具函数助你提升开发效率!

以下文章来源于前端充电宝 ,作者CUGGZ

今天来看看JavaScript中的一些实用的工具函数,希望能帮助你提高开发效率!整理不易,如果觉得有用就点个赞吧!

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1. 数字操作

(1)生成指定范围随机数

 export const randomNum = (min, max) => Math.floor(Math.random() * (max - min + 1)) + min;

(2)数字千分位分隔

 export const format = (n) => {
     let num = n.toString();
     let len = num.length;
     if (len <= 3) {
         return num;
     } else {
         let temp = '';
         let remainder = len % 3;
         if (remainder > 0) { // 不是3的整数倍
             return num.slice(0, remainder) + ',' + num.slice(remainder, len).match(/\d{3}/g).join(',') + temp;
         } else { // 3的整数倍
             return num.slice(0, len).match(/\d{3}/g).join(',') + temp; 
         }
     }
 }

2. 数组操作

(1)数组乱序

 export const arrScrambling = (arr) => {
     for (let i = 0; i < arr.length; i++) {
       const randomIndex = Math.round(Math.random() * (arr.length - 1 - i)) + i;
       [arr[i], arr[randomIndex]] = [arr[randomIndex], arr[i]];
     }
     return arr;
 }

(2)数组扁平化

 xport const flatten = (arr) => {
   let result = [];
 
   for(let i = 0; i < arr.length; i++) {
     if(Array.isArray(arr[i])) {
       result = result.concat(flatten(arr[i]));
     } else {
       result.push(arr[i]);
     }
   }
   return result;
 }

(3)数组中获取随机数

 export const sample = arr => arr[Math.floor(Math.random() * arr.length)];

3. 字符串操作

(1)生成随机字符串

 export const randomString = (len) => {
     let chars = 'ABCDEFGHJKMNPQRSTWXYZabcdefhijkmnprstwxyz123456789';
     let strLen = chars.length;
     let randomStr = '';
     for (let i = 0; i < len; i++) {
         randomStr += chars.charAt(Math.floor(Math.random() * strLen));
     }
     return randomStr;
 };
 

(2)字符串首字母大写

 export const fistLetterUpper = (str) => {
     return str.charAt(0).toUpperCase() + str.slice(1);
 };
 

(3)手机号中间四位变成*

 export const telFormat = (tel) => {
    tel = String(tel); 
     return tel.substr(0,3) + "****" + tel.substr(7);
 };
 

(4)驼峰命名转换成短横线命名

 export const getKebabCase = (str) => {
     return str.replace(/[A-Z]/g, (item) => '-' + item.toLowerCase())
 }
 

(5)短横线命名转换成驼峰命名

 export const getCamelCase = (str) => {
     return str.replace( /-([a-z])/g, (i, item) => item.toUpperCase())
 }
 

(6)全角转换为半角

 export const toCDB = (str) => {
   let result = "";
   for (let i = 0; i < str.length; i++) {
     code = str.charCodeAt(i);
     if (code >= 65281 && code <= 65374) {
       result += String.fromCharCode(str.charCodeAt(i) - 65248);
     } else if (code == 12288) {
       result += String.fromCharCode(str.charCodeAt(i) - 12288 + 32);
     } else {
       result += str.charAt(i);
     }
   }
   return result;
 }
 
 

(7)半角转换为全角

export const toDBC = (str) => {
  let result = "";
  for (let i = 0; i < str.length; i++) {
    code = str.charCodeAt(i);
    if (code >= 33 && code <= 126) {
      result += String.fromCharCode(str.charCodeAt(i) + 65248);
    } else if (code == 32) {
      result += String.fromCharCode(str.charCodeAt(i) + 12288 - 32);
    } else {
      result += str.charAt(i);
    }
  }
  return result;
}

4. 格式转化

(1)数字转化为大写金额

 export const digitUppercase = (n) => {
     const fraction = ['角', '分'];
     const digit = [
         '零', '壹', '贰', '叁', '肆',
         '伍', '陆', '柒', '捌', '玖'
     ];
     const unit = [
         ['元', '万', '亿'],
         ['', '拾', '佰', '仟']
     ];
     n = Math.abs(n);
     let s = '';
     for (let i = 0; i < fraction.length; i++) {
         s += (digit[Math.floor(n * 10 * Math.pow(10, i)) % 10] + fraction[i]).replace(/零./, '');
     }
     s = s || '整';
     n = Math.floor(n);
     for (let i = 0; i < unit[0].length && n > 0; i++) {
         let p = '';
         for (let j = 0; j < unit[1].length && n > 0; j++) {
             p = digit[n % 10] + unit[1][j] + p;
             n = Math.floor(n / 10);
         }
         s = p.replace(/(零.)*零$/, '').replace(/^$/, '零') + unit[0][i] + s;
     }
     return s.replace(/(零.)*零元/, '元')
         .replace(/(零.)+/g, '零')
         .replace(/^整$/, '零元整');
 };
 

(2)数字转化为中文数字

 export const intToChinese = (value) => {
  const str = String(value);
  const len = str.length-1;
  const idxs = ['','十','百','千','万','十','百','千','亿','十','百','千','万','十','百','千','亿'];
  const num = ['零','一','二','三','四','五','六','七','八','九'];
  return str.replace(/([1-9]|0+)/g, ( $, $1, idx, full) => {
     let pos = 0;
     if($1[0] !== '0'){
       pos = len-idx;
       if(idx == 0 && $1[0] == 1 && idxs[len-idx] == '十'){
         return idxs[len-idx];
       }
       return num[$1[0]] + idxs[len-idx];
     } else {
       let left = len - idx;
       let right = len - idx + $1.length;
       if(Math.floor(right / 4) - Math.floor(left / 4) > 0){
         pos = left - left % 4;
       }
       if( pos ){
         return idxs[pos] + num[$1[0]];
       } else if( idx + $1.length >= len ){
         return '';
       }else {
         return num[$1[0]]
       }
     }
    });
 }
 

5. 操作存储

(1)存储loalStorage

export const loalStorageSet = (key, value) => {
    if (!key) return;
    if (typeof value !== 'string') {
        value = JSON.stringify(value);
    }
    window.localStorage.setItem(key, value);
};

(2)获取localStorage

export const loalStorageGet = (key) => {
    if (!key) return;
    return window.localStorage.getItem(key);
};

(3)删除localStorage

export const loalStorageRemove = (key) => {
    if (!key) return;
    window.localStorage.removeItem(key);
};

(4)存储sessionStorage

export const sessionStorageSet = (key, value) => {
   if (!key) return;
    if (typeof value !== 'string') {
      value = JSON.stringify(value);
    }
    window.sessionStorage.setItem(key, value)
};

(5)获取sessionStorage

export const sessionStorageGet = (key) => {
   if (!key) return;
    return window.sessionStorage.getItem(key)
};

(6)删除sessionStorage

export const sessionStorageRemove = (key) => {
   if (!key) return;
    window.sessionStorage.removeItem(key)
};

6. 操作cookie

(1)设置cookie

export const setCookie = (key, value, expire) => {
    const d = new Date();
    d.setDate(d.getDate() + expire);
    document.cookie = `${key}=${value};expires=${d.toUTCString()}`
};

(2)读取cookie

export const getCookie = (key) => {
    const cookieStr = unescape(document.cookie);
       const arr = cookieStr.split('; ');
       let cookieValue = '';
       for (let i = 0; i < arr.length; i++) {
           const temp = arr[i].split('=');
           if (temp[0] === key) {
               cookieValue = temp[1];
               break
       }
    }
    return cookieValue
};

(3)删除cookie

 export const delCookie = (key) => {
     document.cookie = `${encodeURIComponent(key)}=;expires=${new Date()}`
 };
 

7. 格式校验

(1)校验身份证号码

 export const checkCardNo = (value) => {
     let reg = /(^\d{15}$)|(^\d{18}$)|(^\d{17}(\d|X|x)$)/;
     return reg.test(value);
 };
 

(2)校验是否包含中文

 export const haveCNChars => (value) => {
     return /[\u4e00-\u9fa5]/.test(value);
 }
 

(3)校验是否为中国大陆的邮政编码

 export const isPostCode = (value) => {
     return /^[1-9][0-9]{5}$/.test(value.toString());
 }
 

(4)校验是否为IPv6地址

 export const isIPv6 = (str) => {
     return Boolean(str.match(/:/g)?str.match(/:/g).length<=7:false && /::/.test(str)?/^([\da-f]{1,4}(:|::)){1,6}[\da-f]{1,4}$/i.test(str):/^([\da-f]{1,4}:){7}[\da-f]{1,4}$/i.test(str));
 }
 

(5)校验是否为邮箱地址

 export const isEmail = (value) {
     return /^[a-zA-Z0-9_-]+@[a-zA-Z0-9_-]+(\.[a-zA-Z0-9_-]+)+$/.test(value);
 }
 

(6)校验是否为中国大陆手机号

 export const isTel = (value) => {
     return /^1[3,4,5,6,7,8,9][0-9]{9}$/.test(value.toString());
 }
 

(7)校验是否包含emoji表情

 export const isEmojiCharacter = (value) => {
    value = String(value);
     for (let i = 0; i < value.length; i++) {
         const hs = value.charCodeAt(i);
         if (0xd800 <= hs && hs <= 0xdbff) {
             if (value.length > 1) {
                 const ls = value.charCodeAt(i + 1);
                 const uc = ((hs - 0xd800) * 0x400) + (ls - 0xdc00) + 0x10000;
                 if (0x1d000 <= uc && uc <= 0x1f77f) {
                     return true;
                 }
             }
         } else if (value.length > 1) {
             const ls = value.charCodeAt(i + 1);
             if (ls == 0x20e3) {
                 return true;
             }
         } else {
             if (0x2100 <= hs && hs <= 0x27ff) {
                 return true;
             } else if (0x2B05 <= hs && hs <= 0x2b07) {
                 return true;
             } else if (0x2934 <= hs && hs <= 0x2935) {
                 return true;
             } else if (0x3297 <= hs && hs <= 0x3299) {
                 return true;
             } else if (hs == 0xa9 || hs == 0xae || hs == 0x303d || hs == 0x3030
                     || hs == 0x2b55 || hs == 0x2b1c || hs == 0x2b1b
                     || hs == 0x2b50) {
                 return true;
             }
         }
     }
    return false;
 }
 

8. 操作URL

(1)获取URL参数列表

export const GetRequest = () => {
    let url = location.search;
    const paramsStr = /.+\?(.+)$/.exec(url)[1]; // 将 ? 后面的字符串取出来
    const paramsArr = paramsStr.split('&'); // 将字符串以 & 分割后存到数组中
    let paramsObj = {};
    // 将 params 存到对象中
    paramsArr.forEach(param => {
      if (/=/.test(param)) { // 处理有 value 的参数
        let [key, val] = param.split('='); // 分割 key 和 value
        val = decodeURIComponent(val); // 解码
        val = /^\d+$/.test(val) ? parseFloat(val) : val; // 判断是否转为数字
        if (paramsObj.hasOwnProperty(key)) { // 如果对象有 key,则添加一个值
          paramsObj[key] = [].concat(paramsObj[key], val);
        } else { // 如果对象没有这个 key,创建 key 并设置值
          paramsObj[key] = val;
        }
      } else { // 处理没有 value 的参数
        paramsObj[param] = true;
      }
    })
    return paramsObj;
};

(2)检测URL是否有效

export const getUrlState = (URL) => {
  let xmlhttp = new ActiveXObject("microsoft.xmlhttp");
  xmlhttp.Open("GET", URL, false);
  try {
    xmlhttp.Send();
  } catch (e) {
  } finally {
    let result = xmlhttp.responseText;
    if (result) {
      if (xmlhttp.Status == 200) {
        return true;
      } else {
        return false;
      }
    } else {
      return false;
    }
  }
}

(3)键值对拼接成URL参数

export const params2Url = (obj) => {
     let params = []
     for (let key in obj) {
       params.push(`${key}=${obj[key]}`);
     }
     return encodeURIComponent(params.join('&'))
}

(4)修改URL中的参数

export const replaceParamVal => (paramName, replaceWith) {
   const oUrl = location.href.toString();
   const re = eval('/('+ paramName+'=)([^&]*)/gi');
   location.href = oUrl.replace(re,paramName+'='+replaceWith);
   return location.href;
}

(5)删除URL中指定参数

export const funcUrlDel = (name) => {
  const baseUrl = location.origin + location.pathname + "?";
  const query = location.search.substr(1);
  if (query.indexOf(name) > -1) {
    const obj = {};
    const arr = query.split("&");
    for (let i = 0; i < arr.length; i++) {
      arr[i] = arr[i].split("=");
      obj[arr[i][0]] = arr[i][1];
    }
    delete obj[name];
    return baseUrl + JSON.stringify(obj).replace(/[\"\{\}]/g,"").replace(/\:/g,"=").replace(/\,/g,"&");
  }
}

9. 设备判断

(1)判断是移动还是PC设备

export const isMobile = () => {
  if ((navigator.userAgent.match(/(iPhone|iPod|Android|ios|iOS|iPad|Backerry|WebOS|Symbian|Windows Phone|Phone)/i))) {
  return 'mobile';
  }
  return 'desktop';
}

(2)判断是否是苹果还是安卓移动设备

export const isAppleMobileDevice = () => {
  let reg = /iphone|ipod|ipad|Macintosh/i;
  return reg.test(navigator.userAgent.toLowerCase());
}

(3)判断是否是安卓移动设备

export const isAndroidMobileDevice = () => {
  return /android/i.test(navigator.userAgent.toLowerCase());
}

(4)判断是Windows还是Mac系统

export const osType = () => {
    const agent = navigator.userAgent.toLowerCase();
    const isMac = /macintosh|mac os x/i.test(navigator.userAgent);
   const isWindows = agent.indexOf("win64") >= 0 || agent.indexOf("wow64") >= 0 || agent.indexOf("win32") >= 0 || agent.indexOf("wow32") >= 0;
    if (isWindows) {
        return "windows";
    }
    if(isMac){
        return "mac";
    }
}

(5)判断是否是微信/QQ内置浏览器

export const broswer = () => {
    const ua = navigator.userAgent.toLowerCase();
    if (ua.match(/MicroMessenger/i) == "micromessenger") {
        return "weixin";
    } else if (ua.match(/QQ/i) == "qq") {
        return "QQ";
    }
    return false;
}

(6)浏览器型号和版本

export const getExplorerInfo = () => {
    let t = navigator.userAgent.toLowerCase();
    return 0 <= t.indexOf("msie") ? { //ie < 11
        type: "IE",
        version: Number(t.match(/msie ([\d]+)/)[1])
    } : !!t.match(/trident\/.+?rv:(([\d.]+))/) ? { // ie 11
        type: "IE",
        version: 11
    } : 0 <= t.indexOf("edge") ? {
        type: "Edge",
        version: Number(t.match(/edge\/([\d]+)/)[1])
    } : 0 <= t.indexOf("firefox") ? {
        type: "Firefox",
        version: Number(t.match(/firefox\/([\d]+)/)[1])
    } : 0 <= t.indexOf("chrome") ? {
        type: "Chrome",
        version: Number(t.match(/chrome\/([\d]+)/)[1])
    } : 0 <= t.indexOf("opera") ? {
        type: "Opera",
        version: Number(t.match(/opera.([\d]+)/)[1])
    } : 0 <= t.indexOf("Safari") ? {
        type: "Safari",
        version: Number(t.match(/version\/([\d]+)/)[1])
    } : {
        type: t,
        version: -1
    }
}

10. 浏览器操作

(1)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);
  }
}

(2)滚动到页面底部

export const scrollToBottom = () => {
  window.scrollTo(0, document.documentElement.clientHeight);
}

(3)滚动到指定元素区域

export const smoothScroll = (element) => {
    document.querySelector(element).scrollIntoView({
        behavior: 'smooth'
    });
};

(4)获取可视窗口高度

export const getClientHeight = () => {
    let clientHeight = 0;
    if (document.body.clientHeight && document.documentElement.clientHeight) {
        clientHeight = (document.body.clientHeight < document.documentElement.clientHeight) ? document.body.clientHeight : document.documentElement.clientHeight;
    }
    else {
        clientHeight = (document.body.clientHeight > document.documentElement.clientHeight) ? document.body.clientHeight : document.documentElement.clientHeight;
    }
    return clientHeight;
}

(5)获取可视窗口宽度

export const getPageViewWidth = () => {
    return (document.compatMode == "BackCompat" ? document.body : document.documentElement).clientWidth;
}

(6)打开浏览器全屏

 export const toFullScreen = () => {
     let element = document.body;
     if (element.requestFullscreen) {
       element.requestFullscreen()
     } else if (element.mozRequestFullScreen) {
       element.mozRequestFullScreen()
     } else if (element.msRequestFullscreen) {
       element.msRequestFullscreen()
     } else if (element.webkitRequestFullscreen) {
       element.webkitRequestFullScreen()
     }
 }
 

(7)退出浏览器全屏

 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()
     }
 }
 

11. 时间操作

(1)当前时间

 export const nowTime = () => {
     const now = new Date();
     const year = now.getFullYear();
     const month = now.getMonth();
     const date = now.getDate() >= 10 ? now.getDate() : ('0' + now.getDate());
     const hour = now.getHours() >= 10 ? now.getHours() : ('0' + now.getHours());
     const miu = now.getMinutes() >= 10 ? now.getMinutes() : ('0' + now.getMinutes());
     const sec = now.getSeconds() >= 10 ? now.getSeconds() : ('0' + now.getSeconds());
     return +year + "年" + (month + 1) + "月" + date + "日 " + hour + ":" + miu + ":" + sec;
 }
 

(2)格式化时间

 export const dateFormater = (formater, time) => {
     let date = time ? new Date(time) : new Date(),
         Y = date.getFullYear() + '',
         M = date.getMonth() + 1,
         D = date.getDate(),
         H = date.getHours(),
         m = date.getMinutes(),
         s = date.getSeconds();
     return formater.replace(/YYYY|yyyy/g, Y)
         .replace(/YY|yy/g, Y.substr(2, 2))
         .replace(/MM/g,(M<10 ? '0' : '') + M)
         .replace(/DD/g,(D<10 ? '0' : '') + D)
         .replace(/HH|hh/g,(H<10 ? '0' : '') + H)
         .replace(/mm/g,(m<10 ? '0' : '') + m)
         .replace(/ss/g,(s<10 ? '0' : '') + s)
 }
 // dateFormater('YYYY-MM-DD HH:mm:ss')
 // dateFormater('YYYYMMDDHHmmss')
 

12. JavaScript操作

(1)阻止冒泡事件

 export const stopPropagation = (e) => { 
     e = e || window.event; 
     if(e.stopPropagation) {    // W3C阻止冒泡方法 
         e.stopPropagation(); 
     } else { 
         e.cancelBubble = true; // IE阻止冒泡方法 
     } 
 } 
 

(2)防抖函数

 export const debounce = (fn, wait) => {
   let timer = null;
 
   return function() {
     let context = this,
         args = arguments;
 
     if (timer) {
       clearTimeout(timer);
       timer = null;
     }
 
     timer = setTimeout(() => {
       fn.apply(context, args);
     }, wait);
   };
 }
 

(3)节流函数

 export const throttle = (fn, delay) => {
   let curTime = Date.now();
 
   return function() {
     let context = this,
         args = arguments,
         nowTime = Date.now();
 
     if (nowTime - curTime >= delay) {
       curTime = Date.now();
       return fn.apply(context, args);
     }
   };
 }
 

(4)数据类型判断

 export const getType = (value) => {
   if (value === null) {
     return value + "";
   }
   // 判断数据是引用类型的情况
   if (typeof value === "object") {
     let valueClass = Object.prototype.toString.call(value),
       type = valueClass.split(" ")[1].split("");
     type.pop();
     return type.join("").toLowerCase();
   } else {
     // 判断数据是基本数据类型的情况和函数的情况
     return typeof value;
   }
 }
 

(5)对象深拷贝

 export const deepClone = (obj, hash = new WeakMap()) => {
   // 日期对象直接返回一个新的日期对象
   if (obj instanceof Date){
    return new Date(obj);
   } 
   //正则对象直接返回一个新的正则对象     
   if (obj instanceof RegExp){
    return new RegExp(obj);     
   }
   //如果循环引用,就用 weakMap 来解决
   if (hash.has(obj)){
    return hash.get(obj);
   }
   // 获取对象所有自身属性的描述
   let allDesc = Object.getOwnPropertyDescriptors(obj);
   // 遍历传入参数所有键的特性
   let cloneObj = Object.create(Object.getPrototypeOf(obj), allDesc)
   
   hash.set(obj, cloneObj)
   for (let key of Reflect.ownKeys(obj)) { 
     if(typeof obj[key] === 'object' && obj[key] !== null){
      cloneObj[key] = deepClone(obj[key], hash);
     } else {
      cloneObj[key] = obj[key];
     }
   }
   return cloneObj
 }
 

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作者:CUGGZ https://juejin.cn/post/7019090370814279693

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