下拉列表选择判断js

 
function checkallselect(){
         var a1 =document.getElementsByName("attitude1").item(0).value;
         var a2 =document.getElementsByName("attitude2").item(0).value;
         var a3 =document.getElementsByName("attitude3").item(0).value;
         var a4 =document.getElementsByName("attitude4").item(0).value;
         var a5 =document.getElementsByName("attitude5").item(0).value;
         var a6 =document.getElementsByName("attitude6").item(0).value;
         var a7 =document.getElementsByName("attitude7").item(0).value;
         var a8 =document.getElementsByName("attitude8").item(0).value;
         var a9 =document.getElementsByName("attitude9").item(0).value;
         var a10=document.getElementsByName("attitude10").item(0).value;
         if(a1=="没选态度"){
          alert("你第1题没选态度");
          return false;
         }
         if(a2=="没选态度"){
          alert("你第2题没选态度");
          return false;
         }
         if(a3=="没选态度"){
           alert("你第3题没选态度");
           return false;
         }
         if(a4=="没选态度"){
           alert("你第4题没选态度");
           return false;
         }
         if(a5=="没选态度"){
           alert("你第5题没选态度");
           return false;