相关疑难解决方法(0)

var inputTimer = null;

function cycle(element) {
  if (element.attributes.max && element.attributes.min) {
    var prevVal = element.value;
    inputTimer = setTimeout(function() {
      if (prevVal === element.attributes.max.value) {
        element.value = element.attributes.min.value;
      } else if (prevVal === element.attributes.min.value) {
        element.value = element.attributes.max.value;
      }
    }, 50);
  }
}

$("input[type='number']")
  .on("mousedown", function(e) {
    //this event happens before the `input` event!
    cycle(this);
  }).on('keydown', function(e) {
    //up & down arrow keys
    //this event happens before the `input` event! …