关于前端:performance校验运行时间

function run() {    var t = this      , e = performance.timing      , n = {}      , r = function() {        n["DNS解析工夫"] = e.domainLookupEnd - e.domainLookupStart,        n["TCP实现握手工夫"] = e.connectEnd - e.connectStart,        n["重定向工夫"] = e.redirectEnd - e.redirectStart,        n["html的ttfb耗时"] = e.responseStart - e.requestStart,        n["HTTP申请响应实现工夫"] = e.responseEnd - e.requestStart,        n["DOM开始加载前所破费工夫"] = e.responseEnd - e.navigationStart,        n["DOM加载实现工夫"] = e.domComplete - e.domLoading,        n["DOM构造解析实现工夫"] = e.domInteractive - e.domLoading,        n["脚本加载工夫"] = e.domContentLoadedEventEnd - e.domContentLoadedEventStart,        n["onload事件工夫"] = e.loadEventEnd - e.loadEventStart,        n["页面齐全加载工夫"] = n["重定向工夫"] + n["DNS解析工夫"] + n["TCP实现握手工夫"] + n["HTTP申请响应实现工夫"] + n["DOM构造解析实现工夫"] + n["DOM加载实现工夫"],        Object.keys(n).forEach((function(t) {            console.log(t + ":" + n[t] + "ms")        }        ))    };    return r()};window.onload = function () {    run()}

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