92304d4fa2
- 首页双向换算：30种主流货币，实时计算，一键互换 - 汇率总览页：一对多查看所有货币换算结果 - 数据源 open.er-api.com，4小时本地缓存 + 失败兜底 - UI 美化：渐变背景、分色货币块、紫色互换按钮 Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
107 lines
2.4 KiB
JavaScript
107 lines
2.4 KiB
JavaScript
const { CURRENCIES, getPickerData } = require('../../utils/currencies');
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const { getRates, convert, formatAmount, formatRate } = require('../../utils/rate');
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const pickerData = getPickerData();
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const DEFAULT_FROM = 0; // CNY
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const DEFAULT_TO = 1; // USD
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Page({
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data: {
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pickerData,
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fromIndex: DEFAULT_FROM,
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toIndex: DEFAULT_TO,
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amount: '100',
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result: '',
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unitRate: '',
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reverseRate: '',
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updatedAt: '',
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loading: true,
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error: '',
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rates: null,
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baseCurrency: 'CNY',
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},
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onLoad() {
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this.loadRates();
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},
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onPullDownRefresh() {
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this.loadRates().then(() => {
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wx.stopPullDownRefresh();
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});
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},
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async loadRates() {
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this.setData({ loading: true, error: '' });
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try {
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const { rates, updatedAt } = await getRates('CNY');
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this.setData({
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rates,
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baseCurrency: 'CNY',
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updatedAt,
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loading: false,
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});
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this.calculate();
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} catch (e) {
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this.setData({
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loading: false,
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error: '汇率获取失败，请检查网络后下拉刷新',
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});
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}
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},
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calculate() {
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const { rates, fromIndex, toIndex, amount, baseCurrency } = this.data;
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if (!rates) return;
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const num = parseFloat(amount);
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if (isNaN(num) || num <= 0) {
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this.setData({ result: '', unitRate: '', reverseRate: '' });
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return;
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}
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const fromCode = CURRENCIES[fromIndex].code;
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const toCode = CURRENCIES[toIndex].code;
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const converted = convert(num, fromCode, toCode, rates);
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const unitForward = convert(1, fromCode, toCode, rates);
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const unitReverse = convert(1, toCode, fromCode, rates);
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this.setData({
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result: formatAmount(converted, toCode),
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unitRate: `1 ${fromCode} = ${formatRate(unitForward)} ${toCode}`,
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reverseRate: `1 ${toCode} = ${formatRate(unitReverse)} ${fromCode}`,
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});
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},
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handleAmountInput(e) {
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const value = e.detail.value;
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this.setData({ amount: value });
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this.calculate();
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},
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handleFromChange(e) {
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this.setData({ fromIndex: Number(e.detail.value) });
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this.calculate();
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},
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handleToChange(e) {
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this.setData({ toIndex: Number(e.detail.value) });
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this.calculate();
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},
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handleSwap() {
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const { fromIndex, toIndex } = this.data;
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this.setData({
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fromIndex: toIndex,
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toIndex: fromIndex,
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});
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this.calculate();
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},
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goOverview() {
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wx.navigateTo({
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url: '/pages/overview/overview',
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});
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},
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});
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