常用的转换方法

JeremyJone ... 2022-7-11 大约 4 分钟

# 常用的转换方法

# 字符串大小写转换

/**
 * @param {Number} type: 1:首字母大写 2:首字母小写 3:大小写转换 4:全部大写 5:全部小写
 */
export const changeCase = (str, type) => {
  type = type || 4;
  switch (type) {
    case 1:
      return str.replace(/\b\w+\b/g, function(word) {
        return (
          word.substring(0, 1).toUpperCase() + word.substring(1).toLowerCase()
        );
      });
    case 2:
      return str.replace(/\b\w+\b/g, function(word) {
        return (
          word.substring(0, 1).toLowerCase() + word.substring(1).toUpperCase()
        );
      });
    case 3:
      return str
        .split("")
        .map(function(word) {
          if (/[a-z]/.test(word)) {
            return word.toUpperCase();
          } else {
            return word.toLowerCase();
          }
        })
        .join("");
    case 4:
      return str.toUpperCase();
    case 5:
      return str.toLowerCase();
    default:
      return str;
  }
};
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# 连线、下换线模式转小驼峰模式

/**
 * 连线、下划线模式转小驼峰
 * @param {*} str
 * @returns
 */
export const toCamelCase = str => {
  return str.replace(/[-_](\w)/g, (all, letter) => letter.toUpperCase());
};
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# 小驼峰模式转连线模式

连线模式一般用于前端组件命名中。

/**
 * 小驼峰模式转连线模式
 * @param {*} str
 * @returns
 */
export const toHyphenate = str => {
  return str.replace(/([A-Z])/g, "-$1").toLowerCase();
};
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# 小驼峰模式转下划线模式

/**
 * 小驼峰模式转下划线模式
 * @param {*} str
 * @returns
 */
export const toUnderScore = str => {
  return str.replace(/([A-Z])/g, "_$1").toLowerCase();
}
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# 小驼峰模式或下划线模式转帕斯卡模式

/**
 * 小驼峰模式或下划线模式转帕斯卡模式
 * @param {*} str
 * @returns
 */
export const toPascalCase = str => {
  return str.replace(/([A-Z])/g, "_$1").toUpperCase();
}
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# 阿拉伯数字转为中文大写数字

export const convertArabicNumberToChineseCaptialNumber = 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;
};
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# 小写金额转为大写金额

export const convertNumbersToChineseCapitalAmount = 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)) {
    //验证输入的字符是否为数字
    //alert("请检查小写金额是否正确");
    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 "";
      //若数量超过拾亿单位,提示
    }
    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;
};
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# 格式化数字

例如:12345678.9

'0,000.00' -> '12,345,678.90' '0,000' -> '12,345,678' '0.0' -> '12345678.9' '0,000.0' -> '12,345,678.9' '0,000.00%' -> '12,345,678.90%' '$0,000.00' -> '$12,345,678.90'

/**
 * 通过格式化文本转换数字的显示格式
 */
export const formatNumber = (value, format) => {
  if (typeof value !== 'number') return '';
  if (!format) return value;

  const r = RegExp('^([^\\d]*)?(\\d*,?\\d*)*(\\.?\\d*)*([^\\d]*)?$').exec(
    format
  );
  const [, prefix, i, decimal, suffix] = Array.from(r ?? []);

  const integer = (i?.includes(',') ? i?.replace(/^(\d+,)*/g, '') : -1) ?? -1;

  if (suffix === '%') {
    // eslint-disable-next-line no-param-reassign
    value *= 100;
  }

  // 千分位
  const reg = new RegExp(
    `(\\d{1,${integer.length}})(?=(\\d{${integer.length}})+$)`,
    'g'
  );

  return `${prefix ?? ''}${value
    .toFixed(Math.max(0, (decimal?.length ?? 1) - 1))
    .replace(/^(\d+)((\.\d+)?)$/, (s, s1, s2) => {
      return (integer === -1 ? s1 : s1.replace(reg, '$&,')) + s2;
    })}${suffix ?? ''}`;
};
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