// 相对时间格式化
const rtf = new Intl.RelativeTimeFormat('zh', { numeric: 'auto' });
console.log(rtf.format(-1, 'day')); // "昨天"
console.log(rtf.format(7, 'day')); // "7天后"
// 复数规则
const pr = new Intl.PluralRules('en-US');
console.log(pr.select(0)); // "other"
console.log(pr.select(1)); // "one"
console.log(pr.select(2)); // "other"
// 分段器
const segmenter = new Intl.Segmenter('zh', { granularity: 'word' });
const segments = segmenter.segment('你好，世界！');
console.log([...segments].map(s => s.segment)); // ["你好", "，", "世界", "！"]
