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<select name="type" onchange="show_sub(this.options[this.options.selectedIndex].value)">
<option value="0">请选择主菜名</option>
<option value="1">白菜</option>
<option value="2">萝卜</option>
</select>
<select name="type" onchange="show_sub(this.options[this.options.selectedIndex].text)">
<option value="0">请选择主菜名</option>
<option value="1">白菜</option>
<option value="2">萝卜</option>
</select>