附加了javascript的用于输入的加号/减号按钮

<input type="text" id="inputField" value="0">
<button id="plusBtn">+</button>
<button id="minusBtn">-</button>

var inputField = document.getElementById("inputField");
var plusBtn = document.getElementById("plusBtn");
var minusBtn = document.getElementById("minusBtn");

plusBtn.addEventListener("click", function() {
  var currentValue = parseInt(inputField.value);
  inputField.value = currentValue + 1;
});

minusBtn.addEventListener("click", function() {
  var currentValue = parseInt(inputField.value);
  if (currentValue > 0) {
    inputField.value = currentValue - 1;
  }
});