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August 29, 2015 14:03
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workers-execution-contex
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title>Workers get a private execution context.</title> | |
| </head> | |
| <body> | |
| <script> | |
| var worker = new Worker( "worker.js" ); | |
| worker.postMessage( "start" ); | |
| worker.addEventListener( "message", function( evt ) { | |
| // Look! It the method was successfully invoked in the worker. | |
| console.assert( evt.data === "This response generated by Array.prototype.newMethod()" ); | |
| // But... | |
| console.assert( Array.prototype.newMethod !== undefined, "Array.prototype.newMethod doesn't exist." ); | |
| // ... which means the Worker thread and the UI thread don't share global objects like Array.prototype. | |
| }, false ); | |
| </script> | |
| </body> | |
| </html> |
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| // all this worker does is add a method to Array.prototoype. | |
| // The fact that this method is not available on Array.prototype in the UI thread | |
| // indicates that Array.prototype here isn't the same object as Array.prototype there. | |
| self.addEventListener( "message", function( evt ) { | |
| var arr = [1, 2, 3]; | |
| var res; | |
| Array.prototype.newMethod = function() { | |
| return "This response generated by Array.prototype.newMethod()"; | |
| }; | |
| // if this doesn't throw an error, the method has been attached as expected. | |
| res = arr.newMethod(); | |
| self.postMessage( res ); | |
| }); |
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