16个常用到的JS工具方法

首先编写一个公共的脚本，便于整个项目方便调用请求，这里就命名为 utils.js, 为了方便展示，这里就单独拆分了，请自行整理放在一个文件下。代码如下：

如果可以实现记得点赞分享，谢谢老铁～

1.移除金额逗号分隔符

/*
 * 移除金额逗号分隔符
 * 入参：
 *      money：金额
 *
 * 返回：
 *      移除逗号后的金额
 */
const removeMoneyComma = function (money) {
  return money.replace(/,/g, "");
};

2.格式化金额数字，金额逗号分隔符

/*
 * 格式化金额数字，金额逗号分隔符
 *@author zxd
 *
 * 入参：
 *       money：金额
 *
 * 返回：
 *      格式化后的金额
 */
const formatMoneyNumber = function (moneyNum) {
  if (typeof (moneyNum == "number")) {
    moneyNum = moneyNum + "";
  }
  var moneyNum = moneyNum.replace(/,/g, "");
  //var result = isNaN(1 * moneyNum) ? new Number(0) : (1 * moneyNum);
  return /\./.test(moneyNum)
    ? moneyNum.replace(/(\d{1,3})(?=(\d{3})+\.)/g, "$1,")
    : moneyNum.replace(/(\d{1,3})(?=(\d{3})+\b)/g, "$1,");
};

3.格式化金额数字，小数部分和整数部分用不同的样式

/*
  * 格式化金额数字，小数部分和整数部分用不同的样式
  *@author    zxd
  *
  * 入参：
  *      options{money：'',class1:'',class2:''}都为可选

  *
  * 返回：
  *      格式化后的金额html
  */
const formatNumber = function (options) {
  var money =
    options.money < 0 || typeof options.money == "undefined"
      ? 0
      : options.money;
  var class1 = typeof options.class1 == "undefined" ? "f4" : options.class1;
  var class2 = typeof options.class1 == "undefined" ? "f2" : options.class2;
  var formatMoney = string.formatMoneyNumber(money);
  var split = formatMoney.split(".");
  floor = split[0];
  decimal = split[1];
  var html = '<span class="' + class1 + '">' + floor + ".</span>";
  html += '<span class="' + class2 + '">' + decimal + "</span>";
  return html;
};

4.number 类型转换成 有“+” “-” “%” 的形式

//number类型转换成 有“+” “-” “%” 的形式 （固定小数点后两位） 如 “+0.00%”，“-0.30”(场景：涨跌幅)

const toPercentage = function (str) {
  if (str == null) {
    return "+0.00%";
  }
  str = str + "";
  var arr = str.split(".");
  if (arr[1]) {
    if (arr[1].length == 1) {
      str = str + "0";
    } else if (arr[1].length > 2) {
      str = arr[0] + "." + arr[1].slice(0, 2);
    }
  } else {
    str = str + ".00";
  }
  if (str.indexOf("-") == -1) {
    if (str.indexOf("+") == -1) {
      str = "+" + str;
    }
  }
  return str + "%";
};

5.number 类型转换成 带有固定小数位的字符串

//number类型转换成 带有固定小数位的字符串  向下取整  （场景：价格 金额 数量 等）
/**
 * @param number
 * @param scaleAmount
 * @returns {string}
 */
const toRoundDown = function (number, scaleAmount) {
  if (number == null) {
    return "--.--";
  }
  //因为科学计数法处理的方法入参必须为字符串
  var numStr = number + "";
  if (numStr.indexOf("e") != -1) {
    numStr = scienceNum(number);
    number = numStr;
  }
  var index = numStr.indexOf(".");
  if (index == -1) {
    //number为整数
    if (scaleAmount > 0) {
      var endStr = ".";
      for (var i = 0; i < scaleAmount; i++) {
        endStr += "0";
      }
    } else {
      var endStr = "";
    }
    return number + endStr;
  } else {
    //number不为整数
    var endStr = (number + "").slice(index + 1);
    var startStr = (number + "").slice(0, index);
    //如果scaleAmount>0
    if (scaleAmount > 0) {
      //现有小数点位数 大于需要保留的位数  直接截取
      if (endStr.length > scaleAmount) {
        return startStr + "." + endStr.slice(0, scaleAmount);
      } else {
        var len = scaleAmount - endStr.length;
        var endStr = "";
        if (len != 0) {
          for (var j = 0; j < len; j++) {
            endStr += "0";
          }
        }
        return number + endStr;
      }
    } else if (scaleAmount == 0) {
      //如果scaleAmount = 0
      if (number < 0) {
        return -1 * Math.floor(-1 * number) + "";
      } else {
        return Math.floor(number) + "";
      }
    }
  }
};

6.科学计数法转换

/**
 * 科学计数法转换
 * @param value
 * @returns {*}
 */
const scienceNum = (value) => {
  if (isEmpty(value)) {
    return value;
  }
  value = value.toString();
  if (value.indexOf("e") > 0 || value.indexOf("E") > 0) {
    var ePart;
    var scalePart;
    var valueList;
    if (value.indexOf("e") > 0) {
      valueList = value.split("e");
    } else if (value.indexOf("E") > 0) {
      valueList = value.split("E");
    }
    if (valueList.length < 2) {
      return value;
    }
    ePart = valueList[0];
    scalePart = valueList[1];
    var result;
    if (ePart.indexOf(".") > 0) {
      var ePartList = ePart.split(".");
      var fLength = ePartList[0].length;
      var sLength = ePartList[1].length;
      if (scalePart.indexOf("-") >= 0) {
        if (ePartList[0].indexOf("-") >= 0) {
          ePartList[0] = ePartList[0].replace("-", "");
          result = "-0.";
        } else {
          result = "0.";
          ePartList[0] = ePartList[0].replace("+", "");
        }
        var scalePartList = scalePart.split("-");
        for (var i = 0; i < scalePartList[1] - 1; i++) {
          result = result + "0";
        }
        result = result + ePartList[0] + ePartList[1];
        return result;
      } else {
        var scalePartList;
        if (scalePart.indexOf("+") >= 0) {
          scalePartList = scalePart.split("+");
          scalePartList = scalePartList[1];
        } else {
          scalePartList = scalePart;
        }
        ePartList[0] = ePartList[0].replace("+", "");
        result = ePartList[0].toString() + ePartList[1].toString();
        var leftLength = scalePartList - sLength;
        if (leftLength > 0) {
          for (var j = 0; j < leftLength; j++) {
            result = result + "0";
          }
        }
        return result;
      }
    } else {
      if (scalePart.indexOf("-") >= 0) {
        if (ePart.indexOf("-") >= 0) {
          ePart = ePart.replace("-", "");
          result = "-0.";
        } else {
          ePart = ePart.replace("+", "");
          result = "0.";
        }
        var scalePartList = scalePart.split("-");
        for (var i = 0; i < scalePartList[1] - 1; i++) {
          result = result + "0";
        }
        result = result + ePart;
        return result;
      } else {
        var scalePartList;
        if (scalePart.indexOf("+") >= 0) {
          scalePartList = scalePart.split("+");
          scalePartList = scalePartList[1];
        } else {
          scalePartList = scalePart;
        }
        ePart = ePart.replace("+", "");
        result = ePart.toString();
        var leftLength = scalePartList;
        if (leftLength > 0) {
          for (var j = 0; j < leftLength; j++) {
            result = result + "0";
          }
        }
        return result;
      }
    }
  }
  return value;
};

function isEmpty(value) {
  return (
    "undefined" === typeof value ||
    null === value ||
    "" === value ||
    "null" === value
  );
}

7.解决 js 浮点数 加法 bug

//解决js 浮点数 加法  bug
/**
 *zn
 * @param arg1
 * @param arg2
 * @returns {number}
 */
const floatAdd = function (arg1, arg2) {
  var r1, r2, m, c;
  try {
    r1 = arg1.toString().split(".")[1].length;
  } catch (e) {
    r1 = 0;
  }
  try {
    r2 = arg2.toString().split(".")[1].length;
  } catch (e) {
    r2 = 0;
  }
  c = Math.abs(r1 - r2);
  m = Math.pow(10, Math.max(r1, r2));
  if (c > 0) {
    var cm = Math.pow(10, c);
    if (r1 > r2) {
      arg1 = Number(arg1.toString().replace(".", ""));
      arg2 = Number(arg2.toString().replace(".", "")) * cm;
    } else {
      arg1 = Number(arg1.toString().replace(".", "")) * cm;
      arg2 = Number(arg2.toString().replace(".", ""));
    }
  } else {
    arg1 = Number(arg1.toString().replace(".", ""));
    arg2 = Number(arg2.toString().replace(".", ""));
  }
  return (arg1 + arg2) / m;
};

8.解决 js 浮点数 减法 bug

//解决js 浮点数 减法  bug
/**
 * zn
 * @param arg1
 * @param arg2
 * @returns {string}
 */
const floatSub = function (arg1, arg2) {
  var r1, r2, m, n;
  try {
    r1 = arg1.toString().split(".")[1].length;
  } catch (e) {
    r1 = 0;
  }
  try {
    r2 = arg2.toString().split(".")[1].length;
  } catch (e) {
    r2 = 0;
  }
  m = Math.pow(10, Math.max(r1, r2));
  //动态控制精度长度
  n = r1 >= r2 ? r1 : r2;
  return ((arg1 * m - arg2 * m) / m).toFixed(n);
};

9.解决 js 浮点数 乘法 bug

//解决 js 浮点数 乘法  bug
/**
 * zn
 * @param arg1
 * @param arg2
 * @returns {number}
 */
cosnt floatMul = function(arg1,arg2)   {
  var m=0,s1=arg1.toString(),s2=arg2.toString();
  try{m+=s1.split(".")[1].length}catch(e){}
  try{m+=s2.split(".")[1].length}catch(e){}
  return Number(s1.replace(".",""))*Number(s2.replace(".",""))/Math.pow(10,m);
}

10.解决 js 浮点数 除法 bug

//解决js 浮点数 除法 bug
/**
 * zn
 * @param arg1
 * @param arg2
 * @returns {number}
 */
const floatDiv = function (arg1, arg2) {
  var t1 = 0,
    t2 = 0,
    r1,
    r2;
  try {
    t1 = arg1.toString().split(".")[1].length;
  } catch (e) {}
  try {
    t2 = arg2.toString().split(".")[1].length;
  } catch (e) {}

  r1 = Number(arg1.toString().replace(".", ""));

  r2 = Number(arg2.toString().replace(".", ""));
  return (r1 / r2) * Math.pow(10, t2 - t1);
};

11.科学计数法转换

/**
 * 科学计数法转换
 * @param value
 * @returns {*}
 */
const scienceNum = function (value) {
  if (isEmpty(value)) {
    return value;
  }
  value = value.toString();
  if (value.indexOf("e") > 0 || value.indexOf("E") > 0) {
    var ePart;
    var scalePart;
    var valueList;
    if (value.indexOf("e") > 0) {
      valueList = value.split("e");
    } else if (value.indexOf("E") > 0) {
      valueList = value.split("E");
    }
    if (valueList.length < 2) {
      return value;
    }
    ePart = valueList[0];
    scalePart = valueList[1];
    var result;
    if (ePart.indexOf(".") > 0) {
      var ePartList = ePart.split(".");
      var fLength = ePartList[0].length;
      var sLength = ePartList[1].length;
      if (scalePart.indexOf("-") >= 0) {
        if (ePartList[0].indexOf("-") >= 0) {
          ePartList[0] = ePartList[0].replace("-", "");
          result = "-0.";
        } else {
          result = "0.";
          ePartList[0] = ePartList[0].replace("+", "");
        }
        var scalePartList = scalePart.split("-");
        for (var i = 0; i < scalePartList[1] - 1; i++) {
          result = result + "0";
        }
        result = result + ePartList[0] + ePartList[1];
        return result;
      } else {
        var scalePartList;
        if (scalePart.indexOf("+") >= 0) {
          scalePartList = scalePart.split("+");
          scalePartList = scalePartList[1];
        } else {
          scalePartList = scalePart;
        }
        ePartList[0] = ePartList[0].replace("+", "");
        result = ePartList[0].toString() + ePartList[1].toString();
        var leftLength = scalePartList - sLength;
        if (leftLength > 0) {
          for (var j = 0; j < leftLength; j++) {
            result = result + "0";
          }
        }
        return result;
      }
    } else {
      if (scalePart.indexOf("-") >= 0) {
        if (ePart.indexOf("-") >= 0) {
          ePart = ePart.replace("-", "");
          result = "-0.";
        } else {
          ePart = ePart.replace("+", "");
          result = "0.";
        }
        var scalePartList = scalePart.split("-");
        for (var i = 0; i < scalePartList[1] - 1; i++) {
          result = result + "0";
        }
        result = result + ePart;
        return result;
      } else {
        var scalePartList;
        if (scalePart.indexOf("+") >= 0) {
          scalePartList = scalePart.split("+");
          scalePartList = scalePartList[1];
        } else {
          scalePartList = scalePart;
        }
        ePart = ePart.replace("+", "");
        result = ePart.toString();
        var leftLength = scalePartList;
        if (leftLength > 0) {
          for (var j = 0; j < leftLength; j++) {
            result = result + "0";
          }
        }
        return result;
      }
    }
  }
  return value;
};

12.按照开头首字母排序

/**
 * 按照开头首字母排序
 * @param str 传入为字符串类型或者数组
 */
const characterSort = function (str) {
  if (typeof str === "string") str = str.split(",");
  if (!Array.isArray(str)) {
    console.error("参数类型错误, 必须为数组或以(,)分割的字符串.");
    return str;
  }
  str.sort();
  return str.join();
};

13.元素 JS 复制功能

/**
 * @param ElementId 传入的dom元素的id, 即：被复制的内容dom标签Id
 * @callback 回调函数 true为复制成功 false为复制不成功
 */
const copyToClipboard = function (ElementId, callback) {
  try {
    // 获取复制内容
    var content =
      document.getElementById(ElementId).innerHTML ||
      document.getElementById(ElementId).value;
    if (!content) {
      callback(false);
    }
    if (window.clipboardData) {
      window.clipboardData.clearData();
      clipboardData.setData("Text", content);
    } else if (navigator.userAgent.indexOf("Opera") != -1) {
      window.location = content;
    } else {
      // 创建元素用于复制
      var aux = document.createElement("input");
      // 设置元素内容
      aux.setAttribute("value", content);
      // 将元素插入页面进行调用
      document.body.appendChild(aux);
      // 复制内容
      aux.select();
      // 将内容复制到剪贴板
      document.execCommand("copy");
      // 删除创建元素
      document.body.removeChild(aux);
    }
    callback(true);
  } catch (e) {
    callback(false);
  }
};

14.解析 url 参数值

//解析url值
/**yt
 * @param ElementId 传入参数名name 获取对应的值
 */
const getQueryString = function (name) {
  var reg = new RegExp("(^|&)" + name + "=([^&]*)(&|$)", "i");
  var r = window.location.search.substr(1).match(reg);
  if (r != null) return unescape(r[2]);
  return null;
};

15.格式化时间

/**
 *  //格式化时间
 * @param value  传入的时间戳
 * @param type  long: 横杠隔开，默认是 '.'
 * @returns {*} long:2022-06-06 12:23:45    默认 2022.06.06
 */
const getTimeFormat = function (value, type) {
  if (value) {
    let oDate = new Date();
    oDate.setTime(value);
    let y = oDate.getFullYear();
    let m = oDate.getMonth() + 1;
    let d = oDate.getDate();

    let h = oDate.getHours();
    let mm = oDate.getMinutes();
    let s = oDate.getSeconds();
    if (type == "long") {
      return (
        y +
        "-" +
        checkTime(m) +
        "-" +
        checkTime(d) +
        " " +
        checkTime(h) +
        ":" +
        checkTime(mm) +
        ":" +
        checkTime(s)
      );
    } else {
      return y + "." + checkTime(m) + "." + checkTime(d);
    }
  }
};

function checkTime(num) {
  if (num < 10) {
    return "0" + num;
  } else {
    return num;
  }
}

16.计算两个时间相差了几个小时

/**
 *  //计算两个时间相差了几个小时
 * @param startDate
 * @param endDate
 * @returns {*}
 */
const getIntervalHour = function (startDate, endDate) {
  var ms = endDate.getTime() - startDate.getTime();
  if (ms < 0) return 0;
  return Math.floor(ms / 1000 / 60 / 60);
};

OK，收工！如果可以实现记得点赞收藏分享，谢谢老铁～