1.動態創建select

復制代碼 代碼如下:

function createSelect(){
var mySelect = document.createElement_x("select");
mySelect.id = "mySelect";
document.body.appendChild(mySelect);
}

復制代碼 代碼如下:

function addOption(){
//根據id查找對象，
var obj=document.getElementByIdx_x('mySelect');
//添加一個選項
obj.add(new Option("文本","值"));
}

復制代碼 代碼如下:

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

復制代碼 代碼如下:

function removeOne(){
var obj=document.getElementByIdx_x('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);
}

復制代碼 代碼如下:

var obj=document.getElementByIdx_x('mySelect');
var index=obj.selectedIndex; //序號，取當前選中選項的序號
var val = obj.options[index].value;

復制代碼 代碼如下:

var obj=document.getElementByIdx_x('mySelect');
var index=obj.selectedIndex; //序號，取當前選中選項的序號
var val = obj.options[index].text;

復制代碼 代碼如下:

var obj=document.getElementByIdx_x('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");

復制代碼 代碼如下:

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