missing : after property ID

I also have an error show to definition of my function like below.

function test(a) {
   //do something;
}

My case to solve the problem by change it to:

test : function(a) {
   //do something;
}

The error is gone.

Problem is with this line:

$('#imagegallery img').each(function({$(this).css({ width: '100%'});});

should be:

    // missing ) --------------------v
$('#imagegallery img').each(function(){$(this).css({ width: '100%'});});

Although you can shorten it like this:

$('#imagegallery img').css({ width: '100%'});

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