javascript - How to grab a class name from a specific ID using jQuery -

i have id has class name such as...

<div id="nav" class="style">

i have array containing of ids called allids. i'm trying select id , grab class name. here have.

var grabclass = $("#"+allids[0]).map(function() {     return this.class; });

i expect var grabclass equal style. however, if console log grabclass says...

[prevobject: b.fn.b.init[1], context: document]

not sure how make grabclass equal id nav's class style.

use below class name

var grabclass = $("#"+allids[0]).attr("class")

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