js 操作select和option

　　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，這裏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); } 整個實例的完整代碼如下： 改進版：在select中添加、修改、刪除option元素 function watch_ini(){ // 初始 for(var i=0; i javascript select options text value
<!-- watch_ini("我","你","