// html

　<input type="number" class="no-negative">

// js

$(".no-negative").on("keydown", function (e) {

    if (e.keyCode == 109 || e.keyCode == 229 || e.keyCode == 189) {

        return false;

    }

})

$(".no-negative").on("prototypechange input", function () {

    var val = $(this).val().substring(0, $(this).val().length - 1);

    if ($(this).val().indexOf('-') != -1 || !$(this).val()) {

        $(this).val(val);

    }

})

// html

<input type="number" class="no-decimal">

// js

$(".no-decimal").on("keydown", function (e) {

    if (e.keyCode == 110 || e.keyCode == 229 || e.keyCode == 190) {

        return false;

    }

})