Internet Explorer, Closure Compiler and Trailing Commas

问题:

I'm using html5boilerplate build script and when minifying the scripts (which uses Google Closure Compiler)

I'm getting this error

-js.all.minify:      [echo] Minifying scripts      [copy] Copying 3 files to /Users/Username/Desktop/Web/intermediate/js     [apply] /Users/Juan/Desktop/Web/js/plugins.js:117: ERROR - Parse error. Internet Explorer has a non-standard intepretation of trailing commas. Arrays will have the wrong length and objects will not parse at all.     [apply]                 }, { duration: 727 })     [apply]                ^

But the code DOES work in IE 8 if run uncompiled.

This is the code

anim1.animate({                     'left': '+=32px',                     'filter': 'alpha(opacity=100)',                     '-moz-opacity': '1',                     '-khtml-opacity': '1',                     'opacity': '1',                 }, { duration: 727 })

How can I make this code pass Compulsure Compiler?

Thanks

回答1:

Remove the superfluous last comma from your object literal:

anim1.animate({     'left': '+=32px',     'filter': 'alpha(opacity=100)',     '-moz-opacity': '1',     '-khtml-opacity': '1',     'opacity': '1'      // 

As the Closure compiler says, literals with such trailing commas cannot be parsed by some browsers.

回答2:

Or enable EcmaScript 5 mode. Ecmascript 5 does standardize the trailing comma behavior but IE8 does not fully support it ES5 (neither does IE9 which is missing strict mode).

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