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function load(url, callback) {
var xhr = new XMLHttpRequest();
xhr.onreadystatechange = onReady;
function onReady() {
if(xhr.readyState < 4 || xhr.status !== 200) {
return;
}
if(xhr.readyState === 4) {
callback(xhr);
}
}
xhr.open('GET', url, true);
xhr.send('');
}
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