html-2

获取select选择的值

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<select id="level_select">
    <option value="1">1</option>
    <option value="2">2</option>
    <option value="3">3</option>
    <option value="4">4</option>
</select>

通过selectedIndex从select的options数组中取值

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var level_select = document.getElementById('level_select');
var selectedIndex = level_select.selectedIndex;
var level = level_select.options[selectedIndex].value; //通过text获取选中的文本值