如何在javascript中对每个值的输入求和？

Question

I would like to have the sum of the values of each checked checkbox input. I tried my best and have problems with the following code:

$("#timediff").on("keyup", function() {

    var v_id = Number("0"); 

    $("input:checked").each(function () { 
      v_id = Number(v_id) +Number($("input:checked").val());

    alert(v_id);
    });

    var s_id = $("#timediff").val();

    if (s_id<=v_id) {
       alert('The"' + s_id +' h" are smaller than "' + v_id + 'h"');
    }else{
          alert('The"' + s_id +' h" are bigger than "' + v_id + 'h"');
    }
  });

My output is always the sum of the repeated value of the first "checked" checkbox.

For example, Checkbox1: Value="5", Checkbox2: Value="2", Checkbox3: Value="1". The output is 15. But I would like to have 8 as the result. Thank you very much for your help.

Answer 1

Change this:

$("input:checked").val()

to this:

$(this).val()

And don't forget to convert s_id to a number before the <= comparison.