Logs a registered member in with an email and password.
について login() function returns a Promise that resolves when the member with
the specified email address and password is logged in.
について login() function only works with existing members. To register a new member use
the register() function.
注：
wix-メンバー-フロントエンド are only partially functional when previewing your site.
View a published version of your site to see their complete functionality.
Login email address.
Member password.