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yabusaio/收集html5 performance信息

Created July 1, 2016 09:29
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performance 包含页面加载到执行完成的整个生命周期中不同执行步骤的执行时间
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收集html5 performance信息
function _performance(){
var REPORT_URL = "xxxx/cgi?perf=";
var perf = (window.webkitPerformance ? window.webkitPerformance : window.msPerformance ),
points = ['navigationStart','unloadEventStart','unloadEventEnd','redirectStart','redirectEnd','fetchStart','domainLookupStart','connectStart','requestStart','responseStart','responseEnd','domLoading','domInteractive','domContentLoadedEventEnd','domComplete','loadEventStart','loadEventEnd'];
var timing = pref.timing;
perf = perf ? perf : window.performance;
if( perf && timing ) {
var arr = [];
var navigationStart = timing[points[0]];
for(var i=0,l=points.length;i<l;i++){
arr[i] = timing[points[i]] - navigationStart;
}
var url = REPORT_URL + arr.join("-");
var img = new Image;
img.onload = img.onerror = function(){
img=null;
}
img.src = url;
}
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