ruby web性能响应时间

require 'watir-webdriver'
require 'watir-webdriver-performance'
b = Watir::Browser.new :chrome
b.goto "http://172.17.3.54:230/"
#获取加载当前页面所有参数
puts b.performance.to_s.gsub(', ',", n")
puts "--------------------------分割线--------------------------"
#我们关心的主要是页面加载时长:response_time,转换为S输出
load_secs = b.performance.summary[:response_time]/1000.0
puts "Load Time:#{load_secs} seconds."
sleep 1
b.close