jquery - Pass parameters to prototype function -


i'm tring modify bootstrap 3 javascript adding new function affix plugin. in particular addded function:

affix.prototype.refresh = function (elem) {   console.log("refresh");   console.log(elem);   this.options.offset.top = elem.offset.top; }

my question is, witch syntax call function passing elem parameter?

i'm tring this:

$("#_mapdiv").affix("refresh",{offset:{top:100}});

but have output in console: 

refresh undefined uncaught typeerror: cannot read property 'offset' of undefined

it should affix.refresh(param).


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