jquery拷贝一个select的内容到另一个select

<select id="select1"  style="width:93%;">
                        <option value="">请选择</option>
                        <option value="0">1</option>
                        <option value="1">2</option>
                        <option value="2">3</option>
                    </select></td>
<select id="select2" style="width:93%;">
                      
                    </select>

 $("#select2").append( $("#select1").find("*").clone(true));