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Use getWeekInfo() instead of weekInfo #30

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Use getWeekInfo() instead of weekInfo #30

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18 changes: 9 additions & 9 deletions js/2024-1-9.intl.md
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Original file line number Diff line number Diff line change
Expand Up @@ -1205,14 +1205,14 @@ en-US一般每周第一天是周日，而zh-CN一般每周第一天是周一。


```jsx
(new Intl.Locale('zh-CN')).weekInfo // {"firstDay":1,"weekend":[6,7],"minimalDays":1}
(new Intl.Locale('en-US')).weekInfo // {"firstDay":7,"weekend":[6,7],"minimalDays":1}
(new Intl.Locale('zh-CN')).getWeekInfo() // {"firstDay":1,"weekend":[6,7],"minimalDays":1}
(new Intl.Locale('en-US')).getWeekInfo() // {"firstDay":7,"weekend":[6,7],"minimalDays":1}

const locale = 'zh-CN'
console.log(new Intl.DateTimeFormat(locale, { weekday: "long" }).format(new Date(0, 0, new Intl.Locale(locale).weekInfo.firstDay))) // '星期一'
console.log(new Intl.DateTimeFormat(locale, { weekday: "long" }).format(new Date(0, 0, new Intl.Locale(locale).getWeekInfo().firstDay))) // '星期一'

const locale = 'en-US'
console.log(new Intl.DateTimeFormat(locale, { weekday: "long" }).format(new Date(0, 0, new Intl.Locale(locale).weekInfo.firstDay))) // 'Sunday'
console.log(new Intl.DateTimeFormat(locale, { weekday: "long" }).format(new Date(0, 0, new Intl.Locale(locale).getWeekInfo().firstDay))) // 'Sunday'
```

能生效的原因是 `new Date(0,0,7)` 等价于 `new Date(1900,0,7)` 对应1900年1月7日（UTC+0），此时对应US的Sunday。而 `new Date(0,0,1)` 对应1900年1月1日（UTC+0），对应CN的星期一。
Expand All @@ -1229,15 +1229,15 @@ console.log(new Intl.DateTimeFormat(locale, { weekday: "long" }).format(new Date
1. 如何获取一周的第一天
```JS
const localeUS = 'en-US'
new Intl.DateTimeFormat(localeUS, { weekday: "long" }).format(new Date(0, 0, new Intl.Locale(localeUS).weekInfo.firstDay)) // 'Sunday'
new Intl.DateTimeFormat(localeUS, { weekday: "long" }).format(new Date(0, 0, new Intl.Locale(localeUS).getWeekInfo().firstDay)) // 'Sunday'

const localeCN = 'zh-CN'
new Intl.DateTimeFormat(localeCN, { weekday: "long" }).format(new Date(0, 0, new Intl.Locale(localeCN).weekInfo.firstDay)) // '星期一'
new Intl.DateTimeFormat(localeCN, { weekday: "long" }).format(new Date(0, 0, new Intl.Locale(localeCN).getWeekInfo().firstDay)) // '星期一'
```
2. 输出一周7天
```JS
const locale = "en-US";
const firstDay = new Intl.Locale(locale).weekInfo.firstDay;
const firstDay = new Intl.Locale(locale).getWeekInfo().firstDay;
const formatInstace = new Intl.DateTimeFormat(locale, { weekday: "long" });
for (let i = 0; i < 7; i++) {
console.log(formatInstace.format(new Date(0, 0, firstDay + i)));
Expand All @@ -1251,7 +1251,7 @@ for (let i = 0; i < 7; i++) {
// Saturday

const localeCN = "zh-CN";
const firstDayCN = new Intl.Locale(localeCN).weekInfo.firstDay;
const firstDayCN = new Intl.Locale(localeCN).getWeekInfo().firstDay;
const formatInstaceCN = new Intl.DateTimeFormat(localeCN, { weekday: "long" });
for (let i = 0; i < 7; i++) {
console.log(formatInstaceCN.format(new Date(0, 0, firstDayCN + i)));
Expand Down Expand Up @@ -1424,4 +1424,4 @@ const intlEn = createIntl(
// Call imperatively
console.log(intlFr.formatNumber(2000000000000)) // 2 000 000 000 000
console.log(intlEn.formatNumber(2000000000000)) // 2,000,000,000,000
```
```