多个选择器，如果在另一个选择器中选择了选项，则禁用该选项

<select id="selector1">
  <option value="option1">选项1</option>
  <option value="option2">选项2</option>
  <option value="option3">选项3</option>
</select>

<select id="selector2">
  <option value="option4">选项4</option>
  <option value="option5">选项5</option>
  <option value="option6">选项6</option>
</select>

var selector1 = document.getElementById("selector1");
var selector2 = document.getElementById("selector2");

selector1.addEventListener("change", function() {
  if (selector1.value === "option1") {
    selector2.options[0].disabled = true;
  } else {
    selector2.options[0].disabled = false;
  }
});