<select>
<option value="" disabled selected>请选择</option>
<option value="1">选项1</option>
<option value="2">选项2</option>
<option value="3">选项3</option>
</select>
<select>
<option value="" disabled selected>请选择</option>
<option value="1">选项1</option>
<option value="2">选项2</option>
<option value="3">选项3</option>
</select>
本文标题：select元素设置默认值，且默认值不可选
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