实现了用户在客户端输入邮箱，点击发送后随机生成4位数字码。有效期为40秒。 输入验证码，点击验证，返回成功或者失败。
实现了用户在2分钟内，仅允许输入错误密码5次。 如果超过次数，限制其登录1小时。（要求每登录失败时，都要给相应提式）
具体详情思路分析在我的CSDN
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