javascript get resource api
function calculate_load_times() {
// Check performance support
if (performance === undefined) {
console.log("= Calculate Load Times: performance NOT supported");
return;
}
// Get a list of "resource" performance entries
var resources = performance.getEntriesByType("resource");
if (resources === undefined || resources.length <= 0) {
console.log("= Calculate Load Times: there are NO `resource` performance records");
return;
}
console.log("= Calculate Load Times");
for (var i=0; i < resources.length; i++) {
console.log("== Resource[" + i + "] - " + resources[i].name);
// Redirect time
var t = resources[i].redirectEnd - resources[i].redirectStart;
console.log("... Redirect time = " + t);
// DNS time
t = resources[i].domainLookupEnd - resources[i].domainLookupStart;
console.log("... DNS lookup time = " + t);
// TCP handshake time
t = resources[i].connectEnd - resources[i].connectStart;
console.log("... TCP time = " + t);
// Secure connection time
t = (resources[i].secureConnectionStart > 0) ? (resources[i].connectEnd - resources[i].secureConnectionStart) : "0";
console.log("... Secure connection time = " + t);
// Response time
t = resources[i].responseEnd - resources[i].responseStart;
console.log("... Response time = " + t);
// Fetch until response end
t = (resources[i].fetchStart > 0) ? (resources[i].responseEnd - resources[i].fetchStart) : "0";
console.log("... Fetch until response end time = " + t);
// Request start until response end
t = (resources[i].requestStart > 0) ? (resources[i].responseEnd - resources[i].requestStart) : "0";
console.log("... Request start until response end time = " + t);
// Start until response end
t = (resources[i].startTime > 0) ? (resources[i].responseEnd - resources[i].startTime) : "0";
console.log("... Start until response end time = " + t);
}
}