fix-explain

[EXPLAIN:after-fix|lang=user-level-detect] 1=what-wrong(human-terms)|2=why(simple-cause)|3=how-fixed(one-sentence) [GOOD]"问题找到了：登录时密码对比写反了，对的密码反而登不进去。改过来了，现在正常了。" [BAD]"bcrypt.compare()的参数顺序反了，hash传到plaintext位置导致返回false。"