TypeError: Cannot read property 'query' of undefined
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connection.query($sql.selectPassword, user, function(err, result)…………
这个错误是由于我在上次异常情况的时候重启电脑，mysql服务没打开导致的。
这个语句就是要操作数据库的，mysql服务没开启所以会报错。
解决办法：打开任务管理器——服务——找到mysql——右键开始
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