如何使用Javascript根据父级的回答来设置依赖字段的默认值？

// HTML代码
<input type="text" id="parentField">
<input type="text" class="dependentField">
<input type="text" class="dependentField">
<input type="text" class="dependentField">

// Javascript代码
var parentField = document.getElementById("parentField");
var dependentFields = document.getElementsByClassName("dependentField");

parentField.addEventListener("change", function() {
  var parentValue = parentField.value;

  // 根据父级字段的值设置依赖字段的默认值
  if (parentValue === "A") {
    for (var i = 0; i < dependentFields.length; i++) {
      dependentFields[i].value = "Default value for A";
    }
  } else if (parentValue === "B") {
    for (var i = 0; i < dependentFields.length; i++) {
      dependentFields[i].value = "Default value for B";
    }
  } else {
    for (var i = 0; i < dependentFields.length; i++) {
      dependentFields[i].value = "";
    }
  }
});