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web worker2
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <meta name="viewport" content="width=device-width, initial-scale=1.0"> | |
| <meta http-equiv="X-UA-Compatible" content="ie=edge"> | |
| <title>WebWorker</title> | |
| </head> | |
| <body> | |
| <h1>WebWorker</h1> | |
| <script> | |
| let worker = new Worker('worker.js'); | |
| let map = new Map(); | |
| let counter = 0; | |
| worker.onmessage = function(e) { | |
| switch (e.data.type) { | |
| case 'success': | |
| map.get(e.data.id).resolve(e); | |
| break; | |
| case 'failure': | |
| map.get(e.data.id).reject(e); | |
| break; | |
| default: | |
| console.error('program error'); | |
| } | |
| map.delete(e.data.id); | |
| } | |
| function getPromise(message) { | |
| return new Promise(function(resolve, reject) { | |
| map.set(counter, { resolve:resolve, reject:reject} ); | |
| worker.postMessage({ id:counter, message:message }); | |
| counter++; | |
| }); | |
| } | |
| getPromise(1).then(x => console.log(`@@@ret mes1 = ${JSON.stringify(x.data)}`)).catch(e => console.error(e)); | |
| getPromise(2).then(x => console.log(`@@@ret mes2 = ${JSON.stringify(x.data)}`)).catch(e => console.error(e)); | |
| getPromise(3).then(x => console.log(`@@@ret mes3 = ${JSON.stringify(x.data)}`)).catch(e => console.error(e)); | |
| getPromise(4).then(x => console.log(`@@@ret mes4 = ${JSON.stringify(x.data)}`)).catch(e => console.error(e)); | |
| getPromise(5).then(x => console.log(`@@@ret mes5 = ${JSON.stringify(x.data)}`)).catch(e => console.error(e)); | |
| </script> | |
| </body> | |
| </html> |
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| onmessage = function(e) { | |
| try { | |
| this.console.log(`recv mes = ${JSON.stringify(e.data)}`); | |
| //throw new Error('error'); | |
| // 適当な重い処理 | |
| let sum = 0; | |
| for (var i = 0; i < 799999; i++) { | |
| for (var j = 0; j < 999; j++) { | |
| sum += j; | |
| } | |
| } | |
| this.postMessage({ id:e.data.id, type:'success' }); | |
| } catch (ee) { | |
| this.postMessage({ id:e.data.id, type:'failure' }); | |
| } | |
| } |
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