Substr returns the substr from start to length.
(s string, length int)
| 615 | |
| 616 | // Substr returns the substr from start to length. |
| 617 | func Substr(s string, length int) string { |
| 618 | bt := []rune(s) |
| 619 | start := 0 |
| 620 | dot := false |
| 621 | |
| 622 | if start > len(bt) { |
| 623 | start = start % len(bt) |
| 624 | } |
| 625 | var end int |
| 626 | if (start + length) > (len(bt) - 1) { |
| 627 | end = len(bt) |
| 628 | } else { |
| 629 | end = start + length |
| 630 | dot = true |
| 631 | } |
| 632 | |
| 633 | str := string(bt[start:end]) |
| 634 | if dot { |
| 635 | str = str + "..." |
| 636 | } |
| 637 | return str |
| 638 | } |
| 639 | |
| 640 | // 分页函数（这个分页函数不具有通用性） |
| 641 | // rollPage:展示分页的个数 |