let numComplete = 0; | |
function checkDone() { | |
++numComplete; | |
if (numComplete == 2) { | |
postMessage(''); | |
} | |
} | |
function makeRequest(request) { | |
var xhr = new XMLHttpRequest; | |
xhr.open('get', request, true); | |
xhr.onreadystatechange = function() { | |
if (xhr.readyState == 4) { | |
checkDone(); | |
} | |
} | |
xhr.send(); | |
} | |
makeRequest('blue.png'); | |
makeRequest('resource_timing_test0.png'); |