javascript 改变 option 颜色?

Question

<script>
var cityList=[];
cityList[0]=["aa","aa0",0,0];
cityList[1]=["bb","bb0",0,0];
cityList[2]=["cc","cc0",1,1];
cityList[3]=["dd","dd0",0,0];
cityList[4]=["ee","ee0",1,1];
function changeCity(subfield2)
{    var obj; 
subfield2.length = 0;
var i;
subfield2.options[subfield2.length] = new Option('','');

for (i=0;i<cityList.length; i++)
{
         obj= new Option(cityList[i][2],cityList[i][1]);
if (cityList[i][3]==0)
{
    obj.style.color="black";
   
}
else
{
   obj.style.color="gray";
}

 subfield2.options[subfield2.length]=obj; 

}
}
</script>
<input type="button" onclick=changeCity(document.all.sel1) value="oooo">
<select id="sel1"></select>

Answer 1

function changeCity(field2,subfield2,classid2)
{
  var classid2 = classid2;  subfield2.length = 0;
  var i;
  subfield2.options[subfield2.length] = new Option('','');
  for (i=0;i<cityList.length; i++)
  { if (cityList[i][0] == classid2)
    { if (cityList[i][3]==0)
      {  //加字体颜色为黑色 style="color:#000000"
         subfield2.options[subfield2.length] = new Option(cityList[i][2],cityList[i][1]);
      }
      else
      {    //加字体颜色为黑色 style="color:#000000"
         subfield2.options[subfield2.length] = new Option(cityList[i][2],cityList[i][1]);
      }
    }
  }
}.................................上面的style该怎么加进去？

Answer 2

function changeCity(field2,subfield2,classid2)
{
  var classid2 = classid2;
  var obj
  subfield2.length = 0;
  var i;
  subfield2.options[subfield2.length] = new Option('','');
  for (i=0;i<cityList.length; i++)
  { if (cityList[i][0] == classid2)
    { if (cityList[i][3]==0)
      {  //加字体颜色为黑色 style="color:#000000"
         
         obj = new Option(cityList[i][2],cityList[i][1]);
         obj.style.color="#000000";
         subfield2.options[subfield2.length]=obj;
      }
      else
      {  
 obj = new Option(cityList[i][2],cityList[i][1]);
         obj.style.color="gray";
         subfield2.options[subfield2.length]=obj;
      }
    }
  }
}

Answer 3

回楼上　clare2003(忘情火) 兄弟，颜色已经改变但改变了全部的 option ，我只想改变应该改变的 option。

Answer 4

我只想改变应该改变的 option。if (cityList[i][3]==0)
      {  //加字体颜色为黑色 style="color:#000000"
         
         obj = new Option(cityList[i][2],cityList[i][1]);
         obj.style.color="#000000";
         subfield2.options[subfield2.length]=obj;
      }else if (cityList[i][3]==5)
      {  //加字体颜色为黑色 style="color:#000000"
         
         obj = new Option(cityList[i][2],cityList[i][1]);
         obj.style.color="#000000";
         subfield2.options[subfield2.length]=obj;
      }哪个要变就在哪个if里写

Answer 5

回楼上　clare2003(忘情火) 兄弟，颜色已经改变但改变了全部的 option ，我只想改变应该改变的 option。
==>
是不是那个执行的都是用一个obj.style.color="#000000";