javascript - why makes anonymous function have more arguments in its statement then in the invocation - 


(function(i, s, o, g, r, a, m) {       i['googleanalyticsobject'] = r;       i[r] = i[r] || function() {           (i[r].q = i[r].q || []).push(arguments)       }, i[r].l = 1 * new date();       = s.createelement(o),           m = s.getelementsbytagname(o)[0];       a.async = 1;       a.src = g;       m.parentnode.insertbefore(a, m)   })(window, document, 'script', 'https://www.google-analytics.com/analytics.js', 'ga');    ga('create', 'ua-28239486-5', 'auto');   ga('send', 'pageview');

this google analytics script. in anonymous function, there 7 arguments, when being invoked, there 5. why code make a , m arguments? see no difference in doing var a , var m in function body.

when trying make file small possible, ways reduce number of characters. yes can use var, adds 5 more characters size of code. 

var a, m; 1234    5

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