javascript - how to put ... if string length is over 12 -

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facebook_user_name=facebook_info[0].url[j]; if(facebook_user_name.length>12) {  }

how put ... if string length on 12. example, name aaaaaaaa bbbbbbb result should aaaaaaaa bbb... thank in advance.

var substring = facebook_user_name.substr(0, 12) + '...';

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