59 lines
1.7 KiB
JavaScript
59 lines
1.7 KiB
JavaScript
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// currencyFormatter.js
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export function numberToCNY(amount) {
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if (amount === 0) return '零元整';
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const CN_NUMS = ['', '壹', '贰', '叁', '肆', '伍', '陆', '柒', '捌', '玖'];
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const CN_INT_UNITS = ['', '拾', '佰', '仟'];
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const CN_INT_BASE = ['元', '萬', '億', '兆'];
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const CN_DEC_UNITS = ['角', '分'];
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const INT_MAX = Math.pow(10, 16) - 1;
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if (amount >= INT_MAX || amount <= -INT_MAX) {
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throw new Error('超出支持的金额范围');
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}
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let parts = amount.toString().split('.');
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let integerPart = parts[0];
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let decimalPart = parts[1] || '';
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// 处理整数部分
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function convertInteger(numStr) {
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let result = '';
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let zeros = 0;
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let unitPos = 0;
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for (let i = numStr.length - 1; i >= 0; i--) {
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let num = parseInt(numStr.charAt(i));
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if (num === 0) {
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zeros++;
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} else {
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if (zeros > 0) {
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result = '零' + result;
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}
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zeros = 0;
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result = CN_NUMS[num] + CN_INT_UNITS[unitPos % 4] + result;
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}
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unitPos++;
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if (unitPos % 4 === 0 && i > 0) {
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result = CN_INT_BASE[Math.floor(unitPos / 4) - 1] + result;
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}
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}
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return result.trim();
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}
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// 处理小数部分
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function convertDecimal(numStr) {
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return numStr.split('').map((digit, index) => {
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return digit !== '0' ? CN_NUMS[digit] + CN_DEC_UNITS[index] : '';
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}).join('');
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}
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let integerResult = convertInteger(integerPart);
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let decimalResult = decimalPart.length > 0 ? convertDecimal(decimalPart) : '整';
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// 连接整数和小数部分，并确保格式正确
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let finalResult = integerResult.replace(/零+$/, '') + '元' + decimalResult;
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finalResult = finalResult.replace(/零+/g, '零');
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return finalResult;
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}
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