例如:
<select name= "test ">
<option value= "a "> a </option>
<option value= "b "> b </option>
<option value= "c "> c </option>
</select>
我在select中显示a,b,c三个选项,但其中b是无法选中的?
------解决方案--------------------
<select name= "test ">
<optgroup label= "group1 " />
<option> a </option>
<option> b </option>
<optgroup label= "group2 " />
<option> c </option>
<option> d </option>
</select>
------解决方案--------------------
http://topic.csdn.net/t/20060324/13/4637350.html