问题是因为您没有给任何输入字段一个名称。

app.post('/signup', function(req,res){
  console.log(req.body);
})

返回值： {}

如果将表单编辑为以下内容：

 div
  form(action='/signup',method='post')
    div(data-role='fieldcontain')
      fieldset(data-role='controlgroup')
        label(for='email') email
           input(id='email',type='text',value='',placeholder='@',name='email')
    div#passworddiv(data-role='fieldcontain')
      fieldset(data-role='controlgroup')
        label(for='password') password
           input(id='password',type='password',value='',placeholder='',name='password')
    div(id='hiddendiv',data-role='fieldcontain')
      fieldset(data-role='controlgroup')
        label(for='hidden_password') password
           input(id='hidden_password',type='text',value='',placeholder='',name='password2')
    div(data-role='fieldcontain')
      fieldset(data-type='vertical', data-role='controlgroup')                                           
       label(for='showpass') show password
       input(id='showpass',type='checkbox')
    div(data-role='fieldcontain')   
      input(type='submit',value='Sign Up',data-transition='fade', data-theme='c')

输入一些数据后，

app.post('/signup', function(req,res){
  console.log(req.body);
})

返回：

{ email: 'testing@fake.com',
  password: 'asdf',
  password2: 'asdf' }