解决方法
禁用自动完成功能的正确方法是这样的：
<input type="text" name="foo" autocomplete="off"/>
要么
<form autocomplete="off" ... >
Mozilla：How to Turn Off Form Autocompletion
Applicable browser versions: Netscape
6.2 (Mozilla 0.9.4) or later. IE 5 or later. …This form attribute is not part of any web standards but was first introduced in Microsoft’s Internet Explorer 5. Netscape introduced it in version 6.2 — in prior versions,this attribute is ignored. The autocomplete attribute was added at the insistance of banks and card issuers — but never followed through on to reach standards certification.
