<select name="type" onchange="show_sub(this.options[this.options.selectedIndex].value)">
<option value="0">请选择主类别</option>
<option value="1">1</option>
<option value="2">2</option>
</select>
<select name=”type” onchange=”show_sub(this.options[this.…
<select name="type" onchange="show_sub(this.options[this.options.selectedIndex].value)">
<option value="0">请选择主类别</option>
<option value="1">1</option>
<option value="2">2</option>
</select>