打开F12，在Console中粘贴如下代码，回车

var e = window.performance
if (e) {
  var t = e.getEntriesByType("navigation")[0]
    , r = 0
  t || (r = (t = e.timing).navigationStart)
  var n = [{
    key: "Redirect",
    desc: "\u7f51\u9875\u91cd\u5b9a\u5411\u7684\u8017\u65f6",
    value: t.redirectEnd - t.redirectStart
  }, {
    key: "AppCache",
    desc: "\u68c0\u67e5\u672c\u5730\u7f13\u5b58\u7684\u8017\u65f6",
    value: t.domainLookupStart - t.fetchStart
  }, {
    key: "DNS",
    desc: "DNS\u67e5\u8be2\u7684\u8017\u65f6",
    value: t.domainLookupEnd - t.domainLookupStart
  }, {
    key: "TCP",
    desc: "TCP\u8fde\u63a5\u7684\u8017\u65f6",
    value: t.connectEnd - t.connectStart
  }, {
    key: "Waiting(TTFB)",
    desc: "\u4ece\u5ba2\u6237\u7aef\u53d1\u8d77\u8bf7\u6c42\u5230\u63a5\u6536\u5230\u54cd\u5e94\u7684\u65f6\u95f4 / Time To First Byte",
    value: t.responseStart - t.requestStart
  }, {
    key: "Content Download",
    desc: "\u4e0b\u8f7d\u670d\u52a1\u7aef\u8fd4\u56de\u6570\u636e\u7684\u65f6\u95f4",
    value: t.responseEnd - t.responseStart
  }, {
    key: "HTTP Total Time",
    desc: "http\u8bf7\u6c42\u603b\u8017\u65f6",
    value: t.responseEnd - t.requestStart
  }, {
    key: "DOMContentLoaded",
    desc: "dom\u52a0\u8f7d\u5b8c\u6210\u7684\u65f6\u95f4",
    value: t.domContentLoadedEventEnd - r
  }, {
    key: "Loaded",
    desc: "\u9875\u9762load\u7684\u603b\u8017\u65f6",
    value: t.loadEventEnd - r
  }]
  console && console.log && console.log(n)
}

即可查看页面各种性能数据

下图是在百度页面作出的打印：