下次自動登入（Remember Me）功能

1、自動登入是否有必要？

2、初期是否預設選中？

3、儲存時間大概有多久？

4、是否應該提示使用者有安全風險？

5、是否有必要采用進階的安全控件？

關于認證，stackoverflow上一篇很全的讨論 [url=http://stackoverflow.com/questions/549/the-definitive-guide-to-form-based-website-authentication]The definitive guide to form based website authentication[/url]

[color=blue][b]Google+[/b][/color]

[img]http://dl2.iteye.com/upload/attachment/0090/0486/a93efbfc-51d8-31a4-b777-00227ec17388.png[/img]

[color=blue][b]Facebook[/b][/color]

[img]http://dl2.iteye.com/upload/attachment/0090/0484/f874ecc1-7f81-34f9-ba32-1021af25d7b6.png[/img]

[color=blue][b]Twitter[/b][/color]

[img]http://dl2.iteye.com/upload/attachment/0090/0488/edac71f8-3f6d-3552-ac5f-957475dd8e69.png[/img]

[color=blue][b]人人網[/b][/color]

[img]http://dl2.iteye.com/upload/attachment/0090/0490/5a80ebbf-6b1b-3e17-a33c-b5f984d56035.png[/img]

[color=blue][b]新浪微網誌[/b][/color]

[img]http://dl2.iteye.com/upload/attachment/0090/0492/50fe25e6-e727-3a58-a01e-60c386f1e48d.png[/img]

[color=blue][b]當當網[/b][/color]

[img]http://dl2.iteye.com/upload/attachment/0090/0494/0e39d1d2-aaf0-30ea-8f64-b8f2aac9a2ed.png[/img]

[color=blue][b]京東[/b][/color]

[img]http://dl2.iteye.com/upload/attachment/0090/0496/69aa80e1-44b1-30ed-921b-59baf2163d34.png[/img]

[color=blue][b]淘寶[/b][/color]

[img]http://dl2.iteye.com/upload/attachment/0090/0498/bcaedb8c-3f04-32e9-a0ae-745e18e06f76.png[/img]

[color=blue][b]樂視網[/b][/color]

[img]http://dl2.iteye.com/upload/attachment/0090/0500/6b51f424-3d8d-3afd-b934-ce1df1f55f33.png[/img]

[color=blue][b]優酷[/b][/color]

[img]http://dl2.iteye.com/upload/attachment/0090/0502/ffe950c7-6b38-31c8-8eff-a60fcb8b58f6.png[/img]

[color=blue][b]攜程[/b][/color]

[img]http://dl2.iteye.com/upload/attachment/0090/0504/33580d25-cf06-3879-b27f-a0aaedf2aedd.png[/img]

[color=blue][b]去哪兒[/b][/color]

[img]http://dl2.iteye.com/upload/attachment/0090/0506/462468dc-db0e-31de-af90-3767581e9f24.png[/img]

[color=blue][b]趕集[/b][/color]

[img]http://dl2.iteye.com/upload/attachment/0090/0508/2ce088b9-d749-30f2-bdbb-494c3164cbfb.png[/img]

[color=blue][b]58同城[/b][/color]

[img]http://dl2.iteye.com/upload/attachment/0090/0518/38166983-65b4-3be3-a9f5-9ea1e043fc5c.png[/img]

[color=blue][b]大衆點評[/b][/color]

[img]http://dl2.iteye.com/upload/attachment/0090/0510/9a625d6e-bc73-3e6c-99e6-c560990ed65a.png[/img]

[color=blue][b]豆瓣[/b][/color]

[img]http://dl2.iteye.com/upload/attachment/0090/0512/bba5a47a-afdd-3b66-919e-fb1d4a07b5de.png[/img]

[color=blue][b]知乎[/b][/color]

[img]http://dl2.iteye.com/upload/attachment/0090/0514/0e5551fc-a459-3698-8339-953c5c74bac9.png[/img]