performance

performance.js

var readyStart = timing.fetchStart - timing.navigationStart;
var redirectTime = timing.redirectEnd  - timing.redirectStart;
var appcacheTime = timing.domainLookupStart  - timing.fetchStart;
var unloadEventTime = timing.unloadEventEnd - timing.unloadEventStart;
var lookupDomainTime = timing.domainLookupEnd - timing.domainLookupStart;
var connectTime = timing.connectEnd - timing.connectStart;
var requestTime = timing.responseEnd - timing.requestStart;
var initDomTreeTime = timing.domInteractive - timing.responseEnd;
var domReadyTime = timing.domComplete - timing.domInteractive; 
var loadEventTime = timing.loadEventEnd - timing.loadEventStart;
var loadTime = timing.loadEventEnd - timing.navigationStart;

console.log('准备新页面时间耗时: ' + readyStart);
console.log('redirect 重定向耗时: ' + redirectTime);
console.log('Appcache 耗时: ' + appcacheTime);
console.log('unload 前文档耗时: ' + unloadEventTime);
console.log('DNS 查询耗时: ' + lookupDomainTime);
console.log('TCP 连接耗时: ' + connectTime);
console.log('Request 请求耗时: ' + requestTime);
console.log('请求完毕至 DOM 加载: ' + initDomTreeTime);
console.log('解释 DOM 树耗时: ' + domReadyTime);
console.log('load 事件耗时: ' + loadEventTime);
console.log('从开始至 load 总耗时: ' + loadTime);