JS给HTML5页面<Select></Select>绑定选中项

$("#is_conference").children()[1].selected = true;
$("#is_conference").selectpicker('refresh');

1 //第二级案件类型发生改变
2         $("#SecondCasetypelist").change(function () {
3             var child = $("#SecondCasetypelist").children();
4             var selecting = 0;
5             for (i = 0; i < child.length; i++) {
6                 if (child[i].selected) {
7                     selecting += 1;
8                 }
9             }
10             if(selecting == 0)
11             {
12                 child[0].selected = true;
13             }
14             else if(selecting > 1)
15             {
16                 child[0].selected = false;
17             }
18             loadHtml($('#tableCustom'), 'CustomReport', { Year: $("#Year").val(), Month: $("#Month").val(), caseStatus: $("#SecondCasetypelist").val(),flot:"2" });
19         });

1  //列出会议类型函数
2     function appendStrConferenceType(source)
3     {
4         debugger
5         var type = $('#con_category').children();
6         if(source == 1)
7         {
8             type[0].selected = true;
9         }
10         else if(source == 2)
11         {
12             type[1].selected = true;
13         }
14         else
15         {
16             type[2].selected = true;
17         }
18     }