静态的常用方法——持续更新，欢迎补充

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utils.js

/**
 * 
 * @param {Object} arr 数组
 * @param {Object} value 值
 */
function isInArray(arr, value) {
  for (var i = 0; i < arr.length; i++) {
    if (value === arr[i]) {
      return true;
    }
  }
  return false;
}
/**
 * 
 * @param {Number} money 数字
 */
function convertCurrency(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;
}
/**
 * 
 * @param {Object} array 数组
 * @param {Number} sliceNum 数字
 * @param {Object} newArray 新数组
 */
function arraySlice(array, sliceNum, newArray) {
  let viod = 0;
  for (let i = 0; i <= array.length; i++) {
    if (i % sliceNum == 0 && i != 0) {
      newArray.push(array.slice(viod, i));
      viod = i;
    }
    if (i + 1 == array.length) {
      newArray.push(array.slice(viod, i + 1));
    }
  }
  return newArray;
}

export {
  convertCurrency,
  isInArray,
  arraySlice
}