我没有如下下拉列表
<select name="dropname[0]">....</select>
<select name="dropname[1]">....</select>
<select name="dropname[2]">....</select>
<select name="dropname[3]">....</select>....
现在我想把焦点放在第二个下拉列表上。我试过这些
document.getElementsByName('dropname')[1].focus();
导致此错误
TypeError: document.getElementsByName(...)[1] is undefined
提前致谢