Created
February 18, 2015 13:49
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <title>Test</title> | |
| </head> | |
| <body> | |
| <h1>This counter should keep counting smoothly: <span id="counter"></span></h1> | |
| <script src="https://cdn.jsdelivr.net/bluebird/latest/bluebird.min.js"></script> | |
| <script> | |
| // counter to make it easy to see when the application freezes | |
| var counter = 0 | |
| requestAnimationFrame(function frame() { | |
| counter += 1 | |
| document.querySelector('#counter').innerHTML = counter | |
| requestAnimationFrame(frame) | |
| }) | |
| // x is a promise that resolves after 1 second | |
| var x = new Promise(function(resolve) { | |
| setTimeout(resolve, 1000) | |
| }) | |
| // y returns a promise that does some task (which depends on x) | |
| function y(task) { | |
| return x.then(function() { throw new Error('Rejected ' + task) }) | |
| } | |
| // create 1000 tasks | |
| var tasks = [] | |
| for (var i = 0; i < 1000; i ++) { | |
| tasks.push('Task ' + i) | |
| } | |
| // run it all | |
| Promise.all(tasks.map(function(task) { return y(task) })) | |
| .then(function(x) { console.log('ok') }) | |
| .catch(function(e) { console.log('rejected by ' + e) }) | |
| </script> | |
| </body> | |
| </html> |
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