webdriver同时打开不同浏览器

有时候需要检测页面的兼容性，一个一个打开页面比较慢，写了一个地址在不同浏览器打开的代码

#encoding:utf-8
require "watir-webdriver"

puts "The url'll be open in different borwser"
puts "Please input the url..."
open_url=gets
puts "The input url is: "+open_url

chrome=Watir::Browser.new:chrome
ff=Watir::Browser.new:ff
ie=Watir::Browser.new:ie

arr_b=[chrome,ff,ie]
arr_b.each {|b|
	b.goto open_url
	}

#arr_b.each {|b| b.close}
puts "end"