点击按钮获取select得value值

此方法是基于jQuery实现得获取option得value得值。

html:

<select id="good_brand" class="form-control">
    <option value="">请选择品牌</option>
    <option value="1">1</option>
    <option value="2">2</option>
</select>
<button id="btn">点击</button>

script:

btn.onclick = function(){
    console.log($("#good_brand").val())
}