javascript - Using jquery from local file work only if work connection to internet -

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i have local library jquery

<script src="/js/jquery.js" type="text/javascript"></script>

i have ajax request 

.post('/default/ajaxasinc/addnew',{'new':$("#name").val()},function(data){ for(var i;i< data.length.i++) {  } },'json');

but work if connection internet active if connection down

i see next exception 

data null [break on error] for(var i=0;i<data.length;i++)

any idea solve problem ?

ps browser firefox not fetch data site data responce local

from looking @ code, place data referenced in callback function "the response of $.post().

i check data valid , contains data before trying for() loop through it.

$.post('/default/ajaxasinc/addnew', {'new':$("#name").val()}, function(data) {     if(data !== undefined && data.length > 0) {         for(var i=0;i< data.length.i++) {          }     }  },'json');

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