jiayongmao

1.動態創建select

      function createSelect(){

       var mySelect = document.createElement("select");
          mySelect.id = "mySelect";  
          document.body.appendChild(mySelect);
      }

2.添加選項option

     function addOption(){

          //根據id查找對象，
           var obj=document.getElementById('mySelect');

           //添加一個選項
        obj.add(new      Option("文本","值"));    //這個只能在IE中有效
         obj.options.add(new Option("text","value")); //這個兼容IE與firefox
     }

3.刪除所有選項option

     function removeAll(){
           var obj=document.getElementById('mySelect');
  
        obj.options.length=0;  

     }

4.刪除一個選項option

function removeOne(){
           var obj=document.getElementById('mySelect');

           //index,要刪除選項的序號，這里取當前選中選項的序號

        var index=obj.selectedIndex;
        obj.options.remove(index);  
     }

5.獲得選項option的值

var obj=document.getElementById('mySelect');

var index=obj.selectedIndex; //序號，取當前選中選項的序號

var val = obj.options[index].value;

6.獲得選項option的文本

var obj=document.getElementById('mySelect');

var index=obj.selectedIndex; //序號，取當前選中選項的序號

var val = obj.options[index].text;

7.修改選項option

var obj=document.getElementById('mySelect');

var index=obj.selectedIndex; //序號，取當前選中選項的序號

var val = obj.options[index]=new Option("新文本","新值");

8.刪除select

      function removeSelect(){
            var mySelect = document.getElementById("mySelect");
        mySelect.parentNode.removeChild(mySelect);
     }