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27 lines
829 B
27 lines
829 B
2 years ago
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function prefetchByLink(url) {
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return new Promise(function(resolve, reject) {
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var link = document.createElement('link');
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link.rel = 'prefetch';
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link.href = url;
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link.onload = resolve;
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link.onerror = reject;
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document.head.appendChild(link);
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});
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}
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function prefetchByXhr(url) {
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return new Promise(function(resolve, reject) {
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var req = new XMLHttpRequest();
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req.open('GET', url, (req.withCredentials = true));
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req.onload = function() {
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req.status === 200 ? resolve() : reject();
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};
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req.send();
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});
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}
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var link = document.createElement('link');
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var supportLink =
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(link.relList || {}).supports && link.relList.supports('prefetch');
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exports = supportLink ? prefetchByLink : prefetchByXhr;
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module.exports = exports;
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