woocommerce/assets/js/frontend/woocommerce.min.js

jQuery(function(a){a(".woocommerce-ordering").on("change","select.orderby",function(){a(this).closest("form").submit()}),a("div.quantity:not(.buttons_added), td.quantity:not(.buttons_added)").addClass("buttons_added").append('<input type="button" value="+" class="plus" />').prepend('<input type="button" value="-" class="minus" />'),a("input.qty:not(.product-quantity input.qty)").each(function(){var b=parseFloat(a(this).attr("min"));b&&b>0&&parseFloat(a(this).val())<b&&a(this).val(b)}),a(document).on("click",".plus, .minus",function(){var b=a(this).closest(".quantity").find(".qty"),c=parseFloat(b.val()),d=parseFloat(b.attr("max")),e=parseFloat(b.attr("min")),f=b.attr("step");c&&""!==c&&"NaN"!==c||(c=0),(""===d||"NaN"===d)&&(d=""),(""===e||"NaN"===e)&&(e=0),("any"===f||""===f||void 0===f||"NaN"===parseFloat(f))&&(f=1),a(this).is(".plus")?b.val(d&&(d==c||c>d)?d:c+parseFloat(f)):e&&(e==c||e>c)?b.val(e):c>0&&b.val(c-parseFloat(f)),b.trigger("change")})});