mechanize useage

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require  "mechanize"
agent = Mechanize.new
page = agent.get("http://www.baidu.com")
result_page = page.form_with(name: "f") do |form|
form["wd"] = "ruby"
end.submit

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agent = Mechanize.new
page = agent.get("http://cms.stage.lanshizi.com/admin/login")
login_form = page.form_with(action: "/admin/login") do |form|
  form["admin_user[username]"] = "sa"
  form["admin_user[password]"] = "sa"
end
cms_page = login_form.submit
if message = cms_page.at(".flash_alert")
  p message.text
else
  p cms_page
end

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@agent.get(@captcha_url).save("captcha.jpg")
@app_list_page = @agent.get(@login_url).form_with(id: "loginForm") do |f|
f.action = "/accounts/signin/"
  f["username"] = @username
  f["password"] = @password
  f["captcha"] = RTesseract.new("captcha.jpg").to_s.strip
end.click_button