木偶人焦点循环遍历输入字段

function focusNextInput(currentInput) {
  var inputs = document.getElementsByTagName("input");
  var currentIndex = Array.prototype.indexOf.call(inputs, currentInput);
  var nextIndex = (currentIndex + 1) % inputs.length;
  var nextInput = inputs[nextIndex];
  nextInput.focus();
}

var inputs = document.getElementsByTagName("input");
for (var i = 0; i < inputs.length; i++) {
  inputs[i].addEventListener("keydown", function(event) {
    if (event.keyCode === 13) { // Enter key
      focusNextInput(this);
    }
  });
}