修正config默认类型导致的后续dbName配置不生效的问题
修正config默认类型导致的后续dbName配置不生效的问题

默认值设置为了字符串 导致后面config使用出现不生效

maxzhang/thinkjs,lukw00/thinkjs,akira-cn/thinkjs,snadn/thinkjs,75team/thinkjs,maxzhang/thinkjs,lukw00/thinkjs,74sharlock/thinkjs,74sharlock/thinkjs,akira-cn/thinkjs,75team/thinkjs,maxzhang/thinkjs,Qihoo360/thinkjs,thinkjs/thinkjs,akira-cn/thinkjs,75team/thinkjs