| 356 | |
| 357 | // ─── 日期格式化（替代 Date.prototype.format 的纯函数版本）── |
| 358 | export function formatDate(date, pattern) { |
| 359 | const pad = (src, len) => { |
| 360 | const neg = src < 0; |
| 361 | let s = String(Math.abs(src)); |
| 362 | while (s.length < len) s = '0' + s; |
| 363 | return (neg ? '-' : '') + s; |
| 364 | }; |
| 365 | if (typeof pattern !== 'string') return date.toString(); |
| 366 | |
| 367 | const y = date.getFullYear(); |
| 368 | const M = date.getMonth() + 1; |
| 369 | const d = date.getDate(); |
| 370 | const H = date.getHours(); |
| 371 | const m = date.getMinutes(); |
| 372 | const s = date.getSeconds(); |
| 373 | const S = date.getMilliseconds(); |
| 374 | |
| 375 | return pattern |
| 376 | .replace(/yyyy/g, pad(y, 4)) |
| 377 | .replace(/yy/g, pad(parseInt(y.toString().slice(2), 10), 2)) |
| 378 | .replace(/MM/g, pad(M, 2)) |
| 379 | .replace(/M/g, M) |
| 380 | .replace(/dd/g, pad(d, 2)) |
| 381 | .replace(/d/g, d) |
| 382 | .replace(/HH/g, pad(H, 2)) |
| 383 | .replace(/H/g, H) |
| 384 | .replace(/hh/g, pad(H % 12, 2)) |
| 385 | .replace(/h/g, H % 12) |
| 386 | .replace(/mm/g, pad(m, 2)) |
| 387 | .replace(/ss/g, pad(s, 2)) |
| 388 | .replace(/SSS/g, pad(S, 3)) |
| 389 | .replace(/S/g, S); |
| 390 | } |
| 391 | |
| 392 | // ─── 字符串字节数（替代 String.prototype.getBytes 的纯函数版本）── |
| 393 | export function getStringBytes(str) { |