javascript - firefox doesn't work for event.target.id -

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i have in javascript

var identifier = event.target.id;

it works on chrome in firefox gives me 

event not defined (?)()gift_c...oval.js (line 16) add(c=object { originalevent=event click, type="click", timestamp=897038643, more...})jquery.min.js (line 3) add(a=click clientx=1023, clienty=158)jquery.min.js (line 3) [break on error]     var identifier = event.target.id;

how can make cross browser competible

have passed event on function()?

something like

$('#id').click(function(event) {      var identifier = event.target.id; });

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