情况一 arr=['a','b'] sql="select * from student where name in (?)" db.query(sql,arr,function(){ console.log(this.sql) }) // select * from student where name in ('a')，只识别到数组的第一个 情况二 arr=['a','b'] sql="select * from student where name in (??)" db.query(sql,arr,function(){ console.log(this.sql) }) // select * from student where name in (`a`,`b`)，识别出来为反引号，语句执行报错 情况三,这种是数组占位符的写法 arr=['a','b'] sql="select * from student where name in (??)" db.query(sql,[arr],function(){ console.log(this.sql) }) // select * from student where name in ('a','b)，识别到整个数组