Question

如何利用javascript获取表单中select下拉列表中所选中项的值value

Answer 1

<select name="" id="select">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
<option value="5">5</option>
<option value="6">6</option>
<option value="7">7</option>
<option value="8">8</option>
</select>
<script>
document.getElementById('select').onchange = function(){
alert(this.value)
};
</script>

Answer 2

<select id="sel"></select>

var val = document.getElementById('sel').value;