[javascript] jQuery check if an input is type checkbox?

I'd like to find out if an input is a checkbox or not, and the following doesn't work:

$("#myinput").attr('checked') === undefined

Thank you once again!

$("#myinput").attr('type') == 'checkbox'

$('#myinput').is(':checkbox')

this is the only work, to solve the issue to detect if checkbox checked or not. It returns true or false, I search it for hours and try everything, now its work to be clear I use EDG as browser and W2UI

A non-jQuery solution is much like a jQuery solution:

document.querySelector('#myinput').getAttribute('type') === 'checkbox'

>>> a=$("#communitymode")[0]
<input id="communitymode" type="checkbox" name="communitymode">
>>> a.type
"checkbox"

Or, more of the style of jQuery:

$("#myinput").attr('type') == 'checkbox'

Use this function:

function is_checkbox(selector) {
    var $result = $(selector);
    return $result[0] && $result[0].type === 'checkbox';
};

Or this jquery plugin:

$.fn.is_checkbox = function () { return this.is(':checkbox'); };