小写数字转汉字或者转为金额

function convertCurrency(money) {    //汉字的数字    // let cnNums = new Array('零', '壹', '贰', '叁', '肆', '伍', '陆', '柒', '捌', '玖');    let cnNums = new Array('零', '一', '二', '三', '四', '五', '六', '七', '八', '九');    //基本单位    // let cnIntRadice = new Array('', '拾', '佰', '仟');    let cnIntRadice = new Array('', '十', '百', '千');    //对应整数部分扩展单位    let cnIntUnits = new Array('', '万', '亿', '兆');    //对应小数部分单位    // let cnDecUnits = new Array('角', '分', '毫', '厘');    let cnDecUnits = new Array('', '', '', '');    //整数金额时后面跟的字符    // let cnInteger = '整';    let cnInteger = '';    //整型完以后的单位    // let cnIntLast = '元';    let cnIntLast = '';    //最大处理的数字    let maxNum = 999999999999999.9999;    //金额整数部分    let integerNum;    //金额小数部分    let decimalNum;    //输出的中文金额字符串    let chineseStr = '';    //分离金额后用的数组，预定义    let parts;    if (money == '') { return '零元整';    }    money = parseFloat(money);    if (money >= maxNum) { //超出最大处理数字 return '超出最大处理数字';    }    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) { let zeroCount = 0; let IntLen = integerNum.length; for (let i = 0; i < IntLen; i++) {     let n = integerNum.substr(i, 1);     let p = IntLen - i - 1;     let q = p / 4;     let 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 != '') { // chineseStr += '' chineseStr += '点' let decLen = decimalNum.length; for (let i = 0; i < decLen; i++) {     let 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;}console.log(convertCurrency(Number(5491.1314)))