cashier-paid/utils/EscPostUtils.js

// 打印机纸宽58mm，页的宽度384，字符宽度为1，每行最多盛放32个字符
// 打印机纸宽80mm，页的宽度576，字符宽度为1，每行最多盛放48个字符
const PAGE_WIDTH = 576;
const MAX_CHAR_COUNT_EACH_LINE = 48;

//字符串转字节序列
export function stringToByte(str) {
  var bytes = new Array();
  var len, c;
  len = str.length;
  for (var i = 0; i < len; i++) {
    c = str.charCodeAt(i);
    if (c >= 0x010000 && c <= 0x10FFFF) {
      bytes.push(((c >> 18) & 0x07) | 0xF0);
      bytes.push(((c >> 12) & 0x3F) | 0x80);
      bytes.push(((c >> 6) & 0x3F) | 0x80);
      bytes.push((c & 0x3F) | 0x80);
    } else if (c >= 0x000800 && c <= 0x00FFFF) {
      bytes.push(((c >> 12) & 0x0F) | 0xE0);
      bytes.push(((c >> 6) & 0x3F) | 0x80);
      bytes.push((c & 0x3F) | 0x80);
    } else if (c >= 0x000080 && c <= 0x0007FF) {
      bytes.push(((c >> 6) & 0x1F) | 0xC0);
      bytes.push((c & 0x3F) | 0x80);
    } else {
      bytes.push(c & 0xFF);
    }
  }
  return bytes;
}

//字节序列转ASCII码
//[0x24, 0x26, 0x28, 0x2A] ==> "$&C*"
export function byteToString(arr) {
  if (typeof arr === 'string') {
    return arr;
  }
  var str = '',
    _arr = arr;
  for (var i = 0; i < _arr.length; i++) {
    var one = _arr[i].toString(2),
      v = one.match(/^1+?(?=0)/);
    if (v && one.length == 8) {
      var bytesLength = v[0].length;
      var store = _arr[i].toString(2).slice(7 - bytesLength);
      for (var st = 1; st < bytesLength; st++) {
        store += _arr[st + i].toString(2).slice(2);
      }
      str += String.fromCharCode(parseInt(store, 2));
      i += bytesLength - 1;
    } else {
      str += String.fromCharCode(_arr[i]);
    }
  }
  return str;
}
//居中
export function Center() {
  var Center = [];
  Center.push(27);
  Center.push(97);
  Center.push(1);
  var strCenter = byteToString(Center);
  return strCenter;
}

//居左
export function Left() {
  var Left = [];
  Left.push(27);
  Left.push(97);
  Left.push(0);
  var strLeft = byteToString(Left);
  return strLeft;
}
//居右
export function Right() {
  var right = [];
  Left.push(27);
  Left.push(97);
  Left.push(2);
  var strRight = byteToString(right);
  return strRight;
}
//标准字体
export function Size1() {
  var Size1 = [];
  Size1.push(29);
  Size1.push(33);
  Size1.push(0);
  var strSize1 = byteToString(Size1);
  return strSize1;
}
//大号字体
/*  放大1倍  n = 0
 *  长宽各放大2倍  n = 17 */
export function Size2(n) {
  var Size2 = [];
  Size2.push(29);
  Size2.push(33);
  Size2.push(n);
  var strSize2 = byteToString(Size2);
  return strSize2;
}

// 字体加粗
export function boldFontOn() {
  var arr = []
  arr.push(27)
  arr.push(69)
  arr.push(1)
  var cmd = byteToString(arr);
  return cmd
}
// 取消字体加粗
export function boldFontOff() {
  var arr = []
  arr.push(27)
  arr.push(69)
  arr.push(0)
  var cmd = byteToString(arr);
  return cmd
}
// 打印并走纸n行
export function feedLines(n = 1) {
  var feeds = []
  feeds.push(27)
  feeds.push(100)
  feeds.push(n)
  var printFeedsLines = byteToString(feeds);
  return printFeedsLines
}
// 切纸
export function cutPaper() {
  var cut = []
  cut.push(29)
  cut.push(86)
  cut.push(49)
  var cutType = byteToString(cut);
  return cutType
}

// 开钱箱
export function open_money_box() {
  var open = []
  open.push(27)
  open.push(112)
  open.push(0)
  open.push(60)
  open.push(255)
  var openType = byteToString(open)
  return openType
}

// 初始化打印机
export function init() {
  var arr = []
  arr.push(27)
  arr.push(68)
  arr.push(0)
  var str = byteToString(arr)
  return str
}
/* 
 设置左边距
 len:
 */

export function setLeftMargin(len = 1) {
  var arr = []
  arr.push(29)
  arr.push(76)
  arr.push(len)
  var str = byteToString(arr)
  return str
}

// 设置打印区域宽度
export function setPrintAreaWidth(width) {
  var arr = []
  arr.push(29)
  arr.push(87)
  arr.push(width)
  var str = byteToString(arr)
  return str
}

/**
 * @param str
 * @returns {boolean} str是否全是中文
 */
export function isChinese(str) {
  return /^[\u4e00-\u9fa5]$/.test(str);
}

// str是否全含中文或者中文标点
export function isHaveChina(str) {
  if (escape(str).indexOf("%u") < 0) {
    return 0
  } else {
    return 1
  }
}
/**
 * 返回字符串宽度(1个中文=2个英文字符)
 * @param str
 * @returns {number}
 */
export function getStringWidth(str) {
  let width = 0;
  for (let i = 0, len = str.length; i < len; i++) {
    width += isHaveChina(str.charAt(i)) ? 2 : 1;
  }
  return width;
}

/**
 * 同一行输出str1, str2，str1居左, str2居右
 * @param {string} str1 内容1
 * @param {string} str2 内容2
 * @param {string} fillWith str1 str2之间的填充字符
 * @param {number} fontWidth 字符宽度 1/2
 *
 */
export function inline(str1, str2, fillWith = ' ', fontWidth = 1) {
  const lineWidth = MAX_CHAR_COUNT_EACH_LINE / fontWidth;
  // 需要填充的字符数量
  let fillCount = lineWidth - (getStringWidth(str1) + getStringWidth(str2)) % lineWidth;
  let fillStr = new Array(fillCount).fill(fillWith.charAt(0)).join('');
  return str1 + fillStr + str2;
}
/**
 * 用字符填充一整行
 * @param {string} fillWith 填充字符
 * @param {number} fontWidth 字符宽度 1/2
 */
export function fillLine(fillWith = '-', fontWidth = 1) {
  const lineWidth = MAX_CHAR_COUNT_EACH_LINE / fontWidth;
  return new Array(lineWidth).fill(fillWith.charAt(0)).join('');
}

/**
 * 文字内容居中，左右用字符填充
 * @param {string} str 文字内容
 * @param {number} fontWidth 字符宽度 1/2
 * @param {string} fillWith str1 str2之间的填充字符
 */
export function fillAround(str, fillWith = '-', fontWidth = 1) {
  const lineWidth = MAX_CHAR_COUNT_EACH_LINE / fontWidth;
  let strWidth = getStringWidth(str);
  // 内容已经超过一行了，没必要填充
  if (strWidth >= lineWidth) {
    return str;
  }
  // 需要填充的字符数量
  let fillCount = lineWidth - strWidth;
  // 左侧填充的字符数量
  let leftCount = Math.round(fillCount / 2);
  // 两侧的填充字符，需要考虑左边需要填充，右边不需要填充的情况
  let fillStr = new Array(leftCount).fill(fillWith.charAt(0)).join('');
  return fillStr + str + fillStr.substr(0, fillCount - leftCount);
}