jquery - Concatenation of 4 input fields -

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i new javascript world trying grab input value 4 separate input fields , concatenate them string end time, can use moments timezone output in various different destinations around world. trying concatenate 4 input's 1 when tested alert, display nan. guidance great.

$(document).ready(function() {    var time1 = $("#time--1").val();   var time2 = $("#time--2").val();   var time3 = $("#time--3").val();   var time4 = $("#time--4").val();      $('.btn').click(function(e) {     e.preventdefault();     var time = time1.val + time2.val + time3.val + time4.val;      alert(time);     });  });

you're calling val() retrieves value of field string or number, , you're calling val on that, return undefined. undefined + undefined == nan.

just sum variables: var time = time1 + time2 + time3 + time4;


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