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June 3, 2023 11:48
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Strange behavior of the IE11 on compat-mode. A function wrapping 'typeof' mis-detect an ActiveXObject.
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <script src="test.js"></script> | |
| </head> | |
| <body> | |
| </body> | |
| </html> |
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| location /ie11-emulateie7/ { | |
| alias /home/oogatta/ie11/; | |
| add_header 'X-UA-Compatible' 'IE=EmulateIE7'; | |
| expires epoch; | |
| add_header Cache-Control private; | |
| add_header Cache-Control must-revalidate; | |
| add_header Cache-Control no-store; | |
| add_header Pragma no-cache; | |
| } | |
| location /ie11-emulateie8/ { | |
| alias /home/oogatta/ie11/; | |
| add_header 'X-UA-Compatible' 'IE=EmulateIE8'; | |
| expires epoch; | |
| add_header Cache-Control private; | |
| add_header Cache-Control must-revalidate; | |
| add_header Cache-Control no-store; | |
| add_header Pragma no-cache; | |
| } | |
| location /ie11-emulateie9/ { | |
| alias /home/oogatta/ie11/; | |
| add_header 'X-UA-Compatible' 'IE=EmulateIE9'; | |
| expires epoch; | |
| add_header Cache-Control private; | |
| add_header Cache-Control must-revalidate; | |
| add_header Cache-Control no-store; | |
| add_header Pragma no-cache; | |
| } | |
| location /ie11-emulateie10/ { | |
| alias /home/oogatta/ie11/; | |
| add_header 'X-UA-Compatible' 'IE=EmulateIE10'; | |
| expires epoch; | |
| add_header Cache-Control private; | |
| add_header Cache-Control must-revalidate; | |
| add_header Cache-Control no-store; | |
| add_header Pragma no-cache; | |
| } | |
| location /ie11-edge/ { | |
| alias /home/oogatta/ie11/; | |
| add_header 'X-UA-Compatible' 'IE=edge'; | |
| expires epoch; | |
| add_header Cache-Control private; | |
| add_header Cache-Control must-revalidate; | |
| add_header Cache-Control no-store; | |
| add_header Pragma no-cache; | |
| } |
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| var isFunction = function(object) { | |
| // only with 'typeof' | |
| return typeof object == 'function'; | |
| }; | |
| // run in one thread. piled up karma | |
| var result = ''; | |
| for ( var i=1; i<12; i++ ) { // the number varies. I'm not sure why. It might be the defference between 32bit and 64bit, or among zones, or something | |
| result += isFunction() + '\n'; | |
| } | |
| // then check in another thread, bang. | |
| setTimeout(function(){ | |
| var dom = document.getElementsByTagName('body')[0]; | |
| alert(isFunction(dom)); // true!, ActiveXObject | |
| alert(result); // all false | |
| alert(isFunction(XMLHttpRequest)); // true, another ActiveXObject | |
| // NOTICE: the type of XMLHttpRequest is 'function' on standard-mode, 'object' on emulateIE7 & emulateIE8 mode | |
| alert(isFunction({})); // false, pure JS Object | |
| },0); |
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