javascript實用技巧:動態建立<select><option>下拉選單

//取得<select>物件
var sel=document.getElementById('selProductNum') ;

//clear all
var len=sel.options.length;
for(var j=0;j<len;j++)
{ sel.options[0] = null; }

//add option
var prodNumArr=prodNums.split(",");
for(var i=0;i<prodNumArr.length;i++)
{ sel.options[i+1]=new Option(prodNumArr[i],prodNumArr[i]); }

// set which one option is selected
sel.options.selectedIndex=1;