无法识别Ruby-WATIR中的元素？

Question

页面：

<input type="submit" class="btn auth-button" value="Submit">

WATIR代码：

Then(/^I click on submit$/) do
  browser.button(:class,"btn auth-button").click
end

例外：

Then I click on submit                                                                                   # Features/Step_definitions/ChefD.rb:178
      element located, but timed out after 30 seconds, waiting for true condition on #<Watir::Button: located: true; {:class=>"btn auth-button", :tag_name=>"button"}> (Watir::Exception::UnknownObjectException)
      ./Features/Step_definitions/ChefD.rb:179:in `/^I click on submit$/'
      features/Sanity_scenarios.feature:47:in `Then I click on submit'

请告诉我如何识别这个元素？

Answer 1

试试这个：

 btn = @browser.button value: 'Submit'
    btn.exists?
    btn.click