Watir：IE中等待X秒后再继续操作的写法

require "watir"

test_site = "http://www.google.com"

ie = Watir::IE.new
xx=Watir::TimeKeeper.new

ie.goto test_site

ie.text_field(:name, "q").set "pickaxe"

#等待60秒后再点击click
xx.sleep(60)

ie.button(:name, "btnG").click