| <script> |
| function xhr(url) { |
| return new Promise(function(resolve, reject) { |
| var request = new XMLHttpRequest(); |
| request.addEventListener( |
| 'error', |
| function(event) { reject(event); }); |
| request.addEventListener( |
| 'load', |
| function(event) { resolve(request.response); }); |
| request.open('GET', url); |
| request.send(); |
| }); |
| } |
| |
| function load_image(url, cross_origin) { |
| return new Promise(function(resolve, reject) { |
| var img = document.createElement('img'); |
| document.body.appendChild(img); |
| img.onload = function() { |
| resolve(); |
| }; |
| img.onerror = function() { |
| reject(); |
| }; |
| if (cross_origin != '') { |
| img.crossOrigin = cross_origin; |
| } |
| img.src = url; |
| }); |
| } |
| </script> |