I have a web app with a JavaScript file using code like the following:

var foo = {a:'b',c:'d',e:'f',};

On my puter, IE9 (9.0.8112.16421) works correctly; the JavaScript is parsed and executed as on Chrome/FF/Safari. Another user claims to have the same version of IE, yet gets this error in the Developer Tools Console:

SCRIPT1028: Expected identifier, string or number 
blob.js?modified=1304026278, line 524 character 136

Column 136 is the trailing ma/closing brace for the object literal.

I've 'fixed' the code so the user should have no more problems, but I'm wondering:
What could make the same version of IE on two different puters treat the JavaScript differently?

I have a web app with a JavaScript file using code like the following:

var foo = {a:'b',c:'d',e:'f',};

On my puter, IE9 (9.0.8112.16421) works correctly; the JavaScript is parsed and executed as on Chrome/FF/Safari. Another user claims to have the same version of IE, yet gets this error in the Developer Tools Console:

SCRIPT1028: Expected identifier, string or number 
blob.js?modified=1304026278, line 524 character 136

Column 136 is the trailing ma/closing brace for the object literal.

I've 'fixed' the code so the user should have no more problems, but I'm wondering:
What could make the same version of IE on two different puters treat the JavaScript differently?

• javascript
• internet-explorer

• as a sidenote, when you place a trailing mar in an array e.g. a,b,c, this array contains 4 not 3 items, the 4th being 'undefined'. Another reason to avoid trailing mars. ( some browsers would say there are 3 and assume the trailing ma is human error ) – Tom J Nowell Commented Oct 3, 2011 at 16:15

2 Answers 2

One of the reasons may be that user has pressed the "Compatibility View" button. The trailing ma causes syntax error in IE7 document mode.

Its most likely due to a browser setting suppressing the error on your browser.