Created
July 10, 2020 16:39
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <meta name="viewport" content="width=device-width"> | |
| <title>JS Bin</title> | |
| </head> | |
| <body> | |
| <input type="file" /> | |
| <script> | |
| var input = document.getElementsByTagName('input')[0]; | |
| const readDataUriFromFile = (file) => { | |
| return new Promise((resolve) => { | |
| const reader = new FileReader(); | |
| reader.addEventListener( | |
| 'load', | |
| function load() { | |
| resolve(reader.result); | |
| reader.removeEventListener('load', load); | |
| }, | |
| false | |
| ); | |
| reader.readAsDataURL(file); | |
| }); | |
| }; | |
| input.addEventListener('change', function() { | |
| var file = this.files[0]; | |
| var slice1 = file.slice(0, 10000); | |
| var slice2 = file.slice(10000, file.size); | |
| var newBlob = new Blob([slice1, slice2], { type: file.type }); | |
| Promise.all([readDataUriFromFile(file), readDataUriFromFile(newBlob)]) | |
| .then(function(r) { console.log(r[0] === r[1])}) | |
| }); | |
| </script> | |
| </body> | |
| </html> |
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