24 lines
797 B
JavaScript
24 lines
797 B
JavaScript
function request_image(url) {
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return new Promise(function(resolve, reject) {
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var img = new Image();
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img.onload = function() { resolve(img); };
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img.onerror = function() { reject(url); };
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img.src = url + '?random-no-cache=' + Math.floor((1 + Math.random()) * 0x10000).toString(16);
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});
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}
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function ping(url, multiplier) {
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return new Promise(function(resolve, reject) {
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var start = (new Date()).getTime();
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var response = function() {
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var delta = ((new Date()).getTime() - start);
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delta *= (multiplier || 1);
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resolve(delta);
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};
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request_image(url).then(response).catch(response);
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setTimeout(function() { reject(Error('Timeout')); }, 5000);
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});
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}
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export default ping; |