如何检测在"Select“下拉列表中选择了哪个选项

// HTML
<select id="mySelect">
  <option value="option1">Option 1</option>
  <option value="option2">Option 2</option>
  <option value="option3">Option 3</option>
</select>

// JavaScript
const selectElement = document.getElementById("mySelect");
selectElement.addEventListener("change", function() {
  const selectedOption = selectElement.value;
  console.log("Selected option: " + selectedOption);
});

// HTML
<select id="mySelect">
  <option value="option1">Option 1</option>
  <option value="option2">Option 2</option>
  <option value="option3">Option 3</option>
</select>

// JavaScript with jQuery
$("#mySelect").change(function() {
  const selectedOption = $(this).val();
  console.log("Selected option: " + selectedOption);
});

<!-- Vue.js -->
<template>
  <select v-model="selectedOption">
    <option value="option1">Option 1</option>
    <option value="option2">Option 2</option>
    <option value="option3">Option 3</option>
  </select>
</template>

<script>
export default {
  data() {
    return {
      selectedOption: ""
    };
  },
  watch: {
    selectedOption(newVal) {
      console.log("Selected option: " + newVal);
    }
  }
};
</script>