Js commonly used tools

Others 2019-06-15 08:48:10 views: null
6163202-0039c4fe722efa0d.png

1, the date format

/**
 * 格式化日期，参数为日期格式,默认为yyyy-MM-dd
 * @param style  格式化前的日期
 * */
Date.prototype.format = function(style){
  if (!style || !(style = style.toString().trim())) style = 'yyyy-MM-dd hh:mm:ss';
  var o = {
    'M+': this.getMonth() + 1, //month
    'd+': this.getDate(),      //day
    'h+': this.getHours(),     //hour
    'm+': this.getMinutes(),   //minute
    's+': this.getSeconds(),   //second
    'q+': Math.floor((this.getMonth() + 3) / 3), //quarter
    'S': this.getMilliseconds() //millisecond
  };
  if (/(y+)/.test(style))
    style = style.replace(RegExp.$1, this.getFullYear().toString().substr(4 - RegExp.$1.length));
  for (var k in o)
    if (new RegExp('(' + k + ')').test(style)) 
      style = style.replace(RegExp.$1, RegExp.$1.length == 1 
      ? o[k]
      : ('00' + o[k]).substr(o[k].toString().length));
  return style;
}

//用法：
console.log(new Date().format('yyyy-MM-dd hh:mm:ss'));  //2019-06-03 12:10:08
console.log(new Date('1992/09/06').format('yyyy-MM-dd'));  //1991-09-06

2, localStorage store, retrieve, delete

/**
 * 存储
 * @param key 键
 * @param value 值
 **/
function setLocalStorage(key, value) {
  value = typeof value != "object" ? value : JSON.stringify(value);
  window.localStorage.setItem(key, value);
};

 /**
  * 获取
  * @params key 键
  **/
function getLocalStorage(key) {
  var obj = window.localStorage.getItem(key);
  return obj && (obj.indexOf('{') === 0 || obj.indexOf("[") === 0) ? eval("(" + obj + ")") : obj;
};

/**
 * 删除
 * @param key: 键
 * 不传参数则清除所有
 **/
function deleteLocalStorage(key) {
  key ? window.localStorage.removeItem(key) : window.localStorage.clear();
}

3, sessionStorage store, retrieve, delete

/**
 * 存储
 * @param key 键
 * @param value 值
 **/
function setSessionStorage(key, value) {
  value = typeof value !== "object" ? value : JSON.stringify(value);
  window.sessionStorage.setItem(key, value);
}

/**
 * 获取
 * @param key 键
 **/
function getSessionStorage(key) {
  var obj = window.sessionStorage.getItem(key);
  return obj && (obj.indexOf("{") === 0 || obj.indexOf("[") === 0) ? eval("(" + obj + ")") : obj;
}

/**
 * 删除
 * @param key: 键
 * 不传参数则清除所有
 **/
function deleteSessionStorage(key) {
  key ? window.sessionStorage.removeItem(key) : window.sessionStorage.clear();
};

4, cookie store, retrieve, delete

/**
 * 存储
 * @param key 键
 * @param value 值
 * @param days 时间，单位为天，为0或者为空时不设定过期时间，浏览器关闭时cookie自动消失
 **/
function setCookie(key, value, days, otherParams) {
  var str = key + '=' + escape(value) + ';path=/';
  var nowTime = new Date().getTime();
  var addDate = new Date(nowTime + days * 24 * 60 * 60 * 1000)
  if (!isNaN(days) && days > 0) str += '; expires=' + addDate.toGMTString();
  if (otherParams && typeof otherParams === 'object')
    for (var i in otherParams) str += ';' + i + '=' + otherParams[i];
  document.cookie = str;
}

/**
 * 获取
 * @param key 键
 * */
function getCookie(key) {
  var arr = document.cookie.match(new RegExp('(^| )' + key + '=([^;]*)(;|$)'));
  if (!arr || !arr.length) return null;
  return unescape(arr[2]);
}

/**
* 删除
* @param key 键
* */
function deleteCookie(key) {
  document.cookie = key + '=;expires=Thu, 01 Jan 1970 00:00:01 GMT;path=/';
}

5, the middle four mobile phone number asterisk

/**
 * @param value 手机号
 * */
function handelMobile(value){
  if(!value) return '';
  if(typeof value !== 'string') value = value.toString();
  return value.replace(/^(\d{3})\d*(\d{4})$/,'$1****$2');
}

6, determine the type of objects and arrays

/**
 * 是否对象
 * @param value 值
 * */
function isObj (value) { 
  return Object.prototype.toString.call(value).slice(8, -1) === 'Object'
}

/**
 * 是否数组
 * @param value值
 * */
function isArray (value) { 
  return Object.prototype.toString.call(value).slice(8, -1) === 'Array'
}

7, gets the specified number of days in the month

/**
 * 判断是否是闰年
 * @param year 当前年份
 * */
function isRunNian(year) {
  if ((!(year % 4) && year % 100) || !(year % 400)) return true;
  return false;
}

/**
 * 获取指定月份的天数
 * @param year  当前年份
 * @param month 当前月份
 * */
function getDaysForMonth(year, month) {
  var datesDate = [31, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
  if (month === 2 && isRunnian(year)) return 29;
  return datesDate[month];
}

8, an array of deduplication

/**
 * 数组去重
 * @param arr 值
 * */
function deWeight(arr){
  if(Array.hasOwnProperty('from')) return Array.from(new Set(arr));
  var newArr = [];
  var flag = true
  for(var i = 0; i < arr.length; i++) {
    if (arr[i] !== arr[i]) {
      if (flag && newArr.indexOf(arr[i]) === -1) {
        newArr.push(arr[i])
        flag = false
      }
    }else{
      if(newArr.indexOf(arr[i]) === -1) newArr.push(arr[i])
    }
  }
  return newArr;
}

9, will be translated into Arabic numerals Chinese capital figures

/**
 * 将阿拉伯数字翻译成中文的大写数字
 * @param num 数字
 * */
function numberToChinese(num) {
  var AA = new Array("零", "一", "二", "三", "四", "五", "六", "七", "八", "九", "十");
  var BB = new Array("", "十", "百", "仟", "萬", "億", "点", "");
  var a = ("" + num).replace(/(^0*)/g, "").split("."),
    k = 0,
    re = "";
  for (var i = a[0].length - 1; i >= 0; i--) {
    switch (k) {
      case 0:
        re = BB[7] + re;
        break;
      case 4:
        if (!new RegExp("0{4}//d{" + (a[0].length - i - 1) + "}$")
          .test(a[0]))
          re = BB[4] + re;
        break;
      case 8:
        re = BB[5] + re;
        BB[7] = BB[5];
        k = 0;
        break;
    }
    if (k % 4 == 2 && a[0].charAt(i + 2) != 0 && a[0].charAt(i + 1) == 0)
      re = AA[0] + re;
    if (a[0].charAt(i) != 0)
      re = AA[a[0].charAt(i)] + BB[k % 4] + re;
    k++;
  }

  if (a.length > 1) // 加上小数部分(如果有小数部分)
  {
    re += BB[6];
    for (var i = 0; i < a[1].length; i++)
      re += AA[a[1].charAt(i)];
  }
  if (re == '一十')
    re = "十";
  if (re.match(/^一/) && re.length == 3)
    re = re.replace("一", "");
  return re;
}

10, the digital amount converted to uppercase

/**
 * 将数字转换为大写金额
 * @param Num 数值
 * */
function changeToChinese(Num) {
  //判断如果传递进来的不是字符的话转换为字符
  if (typeof Num === "number")  Num = new String(Num);
  Num = Num.replace(/,/g, "") //替换tomoney()中的“,”
  Num = Num.replace(/ /g, "") //替换tomoney()中的空格
  Num = Num.replace(/￥/g, "") //替换掉可能出现的￥字符
  if (isNaN(Num)) return "";
  //字符处理完毕后开始转换，采用前后两部分分别转换
  var part = String(Num).split(".");
  var newchar = "";
  //小数点前进行转化
  for (var i = part[0].length - 1; i >= 0; i--) {
    if (part[0].length > 10) return "";
    var tmpnewchar = ""
    var perchar = part[0].charAt(i);
    switch (perchar) {
      case "0":
        tmpnewchar = "零" + tmpnewchar;
        break;
      case "1":
        tmpnewchar = "壹" + tmpnewchar;
        break;
      case "2":
        tmpnewchar = "贰" + tmpnewchar;
        break;
      case "3":
        tmpnewchar = "叁" + tmpnewchar;
        break;
      case "4":
        tmpnewchar = "肆" + tmpnewchar;
        break;
      case "5":
        tmpnewchar = "伍" + tmpnewchar;
        break;
      case "6":
        tmpnewchar = "陆" + tmpnewchar;
        break;
      case "7":
        tmpnewchar = "柒" + tmpnewchar;
        break;
      case "8":
        tmpnewchar = "捌" + tmpnewchar;
        break;
      case "9":
        tmpnewchar = "玖" + tmpnewchar;
        break;
    }
    switch (part[0].length - i - 1) {
      case 0:
        tmpnewchar = tmpnewchar + "元";
        break;
      case 1:
        if (perchar != 0) tmpnewchar = tmpnewchar + "拾";
        break;
      case 2:
        if (perchar != 0) tmpnewchar = tmpnewchar + "佰";
        break;
      case 3:
        if (perchar != 0) tmpnewchar = tmpnewchar + "仟";
        break;
      case 4:
        tmpnewchar = tmpnewchar + "万";
        break;
      case 5:
        if (perchar != 0) tmpnewchar = tmpnewchar + "拾";
        break;
      case 6:
        if (perchar != 0) tmpnewchar = tmpnewchar + "佰";
        break;
      case 7:
        if (perchar != 0) tmpnewchar = tmpnewchar + "仟";
        break;
      case 8:
        tmpnewchar = tmpnewchar + "亿";
        break;
      case 9:
        tmpnewchar = tmpnewchar + "拾";
        break;
    }
    var newchar = tmpnewchar + newchar;
  }
  //小数点之后进行转化
  if (Num.indexOf(".") != -1) {
    if (part[1].length > 2) {
      // alert("小数点之后只能保留两位,系统将自动截断");
      part[1] = part[1].substr(0, 2)
    }
    for (i = 0; i < part[1].length; i++) {
      tmpnewchar = ""
      perchar = part[1].charAt(i)
      switch (perchar) {
        case "0":
          tmpnewchar = "零" + tmpnewchar;
          break;
        case "1":
          tmpnewchar = "壹" + tmpnewchar;
          break;
        case "2":
          tmpnewchar = "贰" + tmpnewchar;
          break;
        case "3":
          tmpnewchar = "叁" + tmpnewchar;
          break;
        case "4":
          tmpnewchar = "肆" + tmpnewchar;
          break;
        case "5":
          tmpnewchar = "伍" + tmpnewchar;
          break;
        case "6":
          tmpnewchar = "陆" + tmpnewchar;
          break;
        case "7":
          tmpnewchar = "柒" + tmpnewchar;
          break;
        case "8":
          tmpnewchar = "捌" + tmpnewchar;
          break;
        case "9":
          tmpnewchar = "玖" + tmpnewchar;
          break;
      }
      if (i == 0) tmpnewchar = tmpnewchar + "角";
      if (i == 1) tmpnewchar = tmpnewchar + "分";
      newchar = newchar + tmpnewchar;
    }
  }
  //替换所有无用汉字
  while (newchar.search("零零") != -1)
    newchar = newchar.replace("零零", "零");
  newchar = newchar.replace("零亿", "亿");
  newchar = newchar.replace("亿万", "亿");
  newchar = newchar.replace("零万", "万");
  newchar = newchar.replace("零元", "元");
  newchar = newchar.replace("零角", "");
  newchar = newchar.replace("零分", "");
  if (newchar.charAt(newchar.length - 1) == "元") {
    newchar = newchar + "整"
  }
  return newchar;
}

11, get url link parameter

/**
 * 指定key获取
 * @param name 键
 * */
function getUrlParam(name){
  var reg = new RegExp("(^|&)"+ name +"=([^&]*)(&|$)");
  var r = decodeURI(window.location.search).substr(1).match(reg);
  if(r != null) return  r[2]; return null;
}

/**
 * 获取全部url参数,并转换成对象
 * */
function getUrlParams(url) {
  var url = url ? url : window.location.href;
  var _pa = url.substring(url.indexOf('?') + 1),
      _arrS = _pa.split('&'),
      _rs = {};
  for (var i = 0, _len = _arrS.length; i < _len; i++) {
    var pos = _arrS[i].indexOf('=');
    if (pos == -1) {
      continue;
    }
    var name = _arrS[i].substring(0, pos),
        value = window.decodeURIComponent(_arrS[i].substring(pos + 1));
    _rs[name] = value;
  }
  return _rs;
}

Reproduced in: https: //www.jianshu.com/p/35fbcb8aed5a

Guess you like

Origin blog.csdn.net/weixin_34194702/article/details/91165276
Recommended
Rushing to the GitHub hot list——How can open source programming languages and frameworks be so cute?
Beijing Humanoid Robot Innovation Center launches Tiangong, the world's first full-size humanoid robot with purely electric drive for anthropomorphic running
Ranking
8个无需编写代码即可使用 Python 内置库的方法
Java collections interview knowledge Lite
Machine learning algorithms foundation - Introduction a (watermelon materials for the book)
(Easy) Ransom Note - LeetCode
[Five days] Qt from entry to actual combat: the second day
Remember once extremely pit father can not download Maven Jar package of issues: IDEA question
The minimum cost Shortest
OSPF study map (the most complete version)
Network Takeaways
GnuPG
Daily
More
2024-04-27(29)
2024-04-26(22)
2024-04-25(32)
2024-04-24(30)
2024-04-23(30)
2024-04-22(5)
2024-04-21(0)
2024-04-20(6)
2024-04-19(5)
2024-04-18(0)

Code World

© 2018 codetd.com