Documentation Index
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函数原型
func substr(s1 string, start int, length int) string
参数介绍
| 参数名称 | 参数介绍 |
|---|---|
| s1 | 需要被分割的字符串 |
| start | 开始分割的位置 |
| length | 分割长度 |
举例
| 待转换数据 | 转换语句 | 输出结果 |
|---|---|---|
abcdefg | substr("abcdefg", 1, 2) | bc |
abcdefg | substr("abcdefg", 100, 2) | "" |
abcdefg | substr("abcdefg", 1, 6) | bcdefg |
abcdefg | substr("abcdefg", 1, 8) | bcdefg |
abcdefg | substr("abcdefg", -1, 100) | Error: "invalid substr index" |
abcdefg | substr("abcdefg", 1, -100) | Error: "invalid substr index" |
abcdefg | substr("abcdefg", 0, 0) | Error: "invalid substr index" |