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1.¶¯Ì¬´´½¨select
      function createSelect(){
        var mySelect = document.createElement("select");
          mySelect.id = "mySelect";  
          document.body.appendChild(mySelect);
      }
2.Ìí¼ÓÑ¡Ïîoption
     function addOption(){
          //¸ù¾Ýid²éÕÒ¶ÔÏó£¬
           var obj=document.getElementById('mySelect');
           //Ìí¼ÓÒ»¸öÑ¡Ïî
        obj.add(new      Option("Îı¾","Öµ"));     //Õâ¸öÖ»ÄÜÔÚIEÖÐÓÐЧ
         obj.options.add(new Option("text","value")); //Õâ¸ö¼æÈÝIEÓëfirefox
     }
3.ɾ³ýËùÓÐÑ¡Ïîoption
     function removeAll(){
           var obj=document.getElementById('mySelect');
  
        obj.options.length=0;  
     }
4.ɾ³ýÒ»¸öÑ¡Ïîoption
function removeOne(){
           var obj=document.getElementById('mySelect');
           //index,Ҫɾ³ýÑ¡ÏîµÄÐòºÅ£¬ÕâÀïÈ¡µ±Ç°Ñ¡ÖÐÑ¡ÏîµÄÐòºÅ
         var index=obj.selectedIndex;
        obj.options.remove(index);   
     }
5.»ñµÃÑ¡ÏîoptionµÄÖµ
var obj=document.getElementById('mySelect');
var index=obj.selectedIndex; //ÐòºÅ£¬È¡µ±Ç°Ñ¡ÖÐÑ¡ÏîµÄÐòºÅ
var val = obj.options[index].value;
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