从request里取值初始化Select控件

var ttSelect = document.getElementById("travelType");

var option = ttSelect.options;

var tt = '<%=request.getAttribute("travelType")%>';

for(var i=0; i<option.length; i++)

{

    if( option[i].value == tt )

    {  

       option[i].selected = true; 

    }

}