[2017]更新:MySQL 5.6支持在线索引更新In MySQL 5.6 and higher, the table remains available for read and write operations while the index is being created or dropped. The CREATE INDEX or DROP INDEX statement only finishes after all transactions tha…
<html><script language"javascript">function showdate(){c new Date(2008,1,29);//输入开学的日期.注意,月份是从0-11;comperc.getTime();//以2008年2月29日作为上半学期结束。然后记录新的开学日期var now new Date();//获取当前时间var d_nownow.ge…