<script type="text/javascript">var mystr="I love JavaScript!";document.write(mystr.substr(7));document.write(mystr.substr(2,4));</script>运行结果:JavaScript!love使用 substring() 从字符串中提取字符串,代码如下:<script ty
报异常: ### Cause: java.sql.SQLSyntaxErrorException: ORA-00979: 不是 GROUP BY 表达式 SELECTSUBSTR( region_code, 1,#{ queryMap.groupCodeLength, jdbcType = INTEGER } ) AS "region_code",count( CASE WHEN TYPE =
[b]substr 函数:[/b] substr('This is a test', 6, 2) would return 'is' substr('This is a test', 6) would return 'is a test' substr('TechOnTheNet', 1, 4) would return 'Tech' substr('TechO