1.动态创建select      function createSelect(){ var mySelect = document.createElement_x("select");           mySelect.id = "mySelect";            document.body.appendChild(mySelect);       } 2.添加选项option      function addOption(){           //根据id查找对象，            var obj=document.getElementByIdx_x('mySelect');            //添加一个选项 obj.add(new Option("文本","值"));    //这个只能在IE中有效          obj.options.add(new Option("text","value")); //这个兼容IE与firefox      } 3.删除所有选项option      function removeAll(){            var obj=document.getElementByIdx_x('mySelect'); obj.options.length=0;      } 4.删除一个选项option function removeOne(){            var obj=document.getElementByIdx_x('mySelect');            //index,要删除选项的序号，这里取当前选中选项的序号 var index=obj.selectedIndex; obj.options.remove(index);      } 5.获得选项option的值 var obj=document.getElementByIdx_x('mySelect'); var index=obj.selectedIndex; //序号，取当前选中选项的序号 var val = obj.options[index].value; 6.获得选项option的文本 var obj=document.getElementByIdx_x('mySelect'); var index=obj.selectedIndex; //序号，取当前选中选项的序号 var val = obj.options[index].text; 7.修改选项option var obj=document.getElementByIdx_x('mySelect'); var index=obj.selectedIndex; //序号，取当前选中选项的序号 var val = obj.options[index]=new Option("新文本","新值"); 8.删除select       function removeSelect(){             var mySelect = document.getElementByIdx_x("mySelect"); mySelect.parentNode.removeChild(mySelect);      }   整个实例的完整代码如下：       
            
     
    
           
     
        改进版：在select中添加、修改、删除option元素 function watch_ini(){ // 初始 for(var i=0; i
        
       
       
       
         
      
 
       
       
 
        
       
       
 
        
        
        
        
      
 用一个字符串创建一个数组方法: 
      
     

 

1.动态创建select

function createSelect(){

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

2.添加选项option

function addOption(){

//根据id查找对象，
var obj=document.getElementByIdx_x('mySelect');

//添加一个选项
obj.add(new Option("文本","值")); //这个只能在IE中有效
obj.options.add(new Option("text","value")); //这个兼容IE与firefox
}

3.删除所有选项option

function removeAll(){

var obj=document.getElementByIdx_x('mySelect');
obj.options.length=0;

}

4.删除一个选项option

function removeOne(){

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

//index,要删除选项的序号，这里取当前选中选项的序号

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

5.获得选项option的值

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

var index=obj.selectedIndex; //序号，取当前选中选项的序号

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

6.获得选项option的文本

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

var index=obj.selectedIndex; //序号，取当前选中选项的序号

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

7.修改选项option

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

var index=obj.selectedIndex; //序号，取当前选中选项的序号

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

8.删除select

function removeSelect(){

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

 

整个实例的完整代码如下：

< !DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//ZH-CN" "http://www.w3.org/TR/html4/strict.dtd">
< html>
< head>
<meta http-equiv="Content-Type" content="text/html">
< head>
<script language=JavaScript>
function $(id)
{

return document.getElementByIdx_x(id)
}
function show()
{

var selectObj=$("area")
var myOption=document.createElement_x("option")
myOption.setAttribute("value","10")
myOption.appendChild(document.createTextNode("上海"))
var myOption1=document.createElement_x("option")
myOption1.setAttribute("value","100")
myOption1.appendChild(document.createTextNode("南京"))
selectObj.appendChild(myOption)
selectObj.appendChild(myOption1)
}
function choice()
{

var index=$("area").selectedIndex;
var val=$("area").options[index].getAttribute("value")
if(val==10)
{

var i=$("context").childNodes.length-1;
var remobj=$("context").childNodes[i];
remobj.removeNode(true)
var sh=document.createElement_x("select")
sh.add(new Option("浦东新区","101"))
sh.add(new Option("黄浦区","102"))
sh.add(new Option("徐汇区","103"))
sh.add(new Option("普陀区","104"))
$("context").appendChild(sh)
}
if(val==100)
{

var i=$("context").childNodes.length-1;
var remobj=$("context").childNodes[i];
remobj.removeNode(true)
var nj=document.createElement_x("select")
nj.add(new Option("玄武区","201"))
nj.add(new Option("白下区","202"))
nj.add(new Option("下关区","203"))
nj.add(new Option("栖霞区","204"))
$("context").appendChild(nj)
}
}
function calc()
{

var x=$("context").childNodes.length-1;
alert(x)
}
function remove()
{

var i=$("context").childNodes.length-1;
var remobj=$("context").childNodes[i];
remobj.removeNode(true)
}
< /script>
< body>
< div id="context">
<select id="area" οnchange="choice()">
< /select>
< /div>
< input type=button value="显示"οnclick="show()">
<input type=button value="计算结点"οnclick="calc()">
< input type=button value="删除"οnclick="remove()">
< /body>
< /html>

 

改进版：在select中添加、修改、删除option元素

function watch_ini(){ // 初始
for(var i=0; i<arguments.length; i++){

var word = document.createElement_x("OPTION");
word.text = arguments[i];
watch.keywords.add(word); // watch. is form name
}
}
function watch_add(f){ // 增加
var word = document.createElement_x("OPTION");
word.text = f.word.value;
f.keywords.add(word);
}
但上述 add() 方法只在IE下有效，为兼容FF和Opera，对上述代码进行了一下改进，改动后代码如下： function watch_ini(){ // 初始
for(var i=0; i<arguments.length; i++){

var oOption=new Option(arguments[i],arguments[i]);
document.getElementByIdx_x("MySelect")[i]=oOption;
}
}
function watch_add(f){ // 增加
var oOption=new Option(f.word.value,f.word.value);
f.keywords[f.keywords.length]=oOption;
}

整个实例的完整代码如下：

< !doctype html public "-//w3c//dtd html 4.0 transitional//en">
< html>
< head>
< title>javascript select options text value</title>
< meta name="keywords" content="javascript select options text value add modify delete set">
< meta name="description" content="javascript select options text value add modify delete set">
< script language="javascript">
< !--
function watch_ini(){ // 初始
for(var i=0; i<arguments.length; i++){

var oOption=new Option(arguments[i],arguments[i]);
document.getElementByIdx_x("MySelect")[i]=oOption;
}
}
function watch_add(f){ // 增加
var oOption=new Option(f.word.value,f.word.value);
f.keywords[f.keywords.length]=oOption;
}
function watch_sel(f){ // 编辑
f.word.value = f.keywords[f.keywords.selectedIndex].text;
}
function watch_mod(f){ // 修改
f.keywords[f.keywords.selectedIndex].text = f.word.value;
}
function watch_del(f){ // 删除
f.keywords.remove(f.keywords.selectedIndex);
}
function watch_set(f){ // 保存
var set = "";
for(var i=0; i<f.keywords.length; i++){

set += f.keywords[i].text + ";";
}
confirm(set);
}
//-->
< /script>
< /head>
< body>
< form name="watch" method="post" action="">
< select id="MySelect" name="keywords" size="10" οnchange="watch_sel(this.form)"></select><br>
< script language="javascript">
< !--
watch_ini("我","你","妳","他","她","它","尔"); // 初始关键词
//-->
< /script>
< input type="text" name="word" /><br />
< input type="button" value="增加"οnclick="watch_add(this.form);" />
< input type="button" value="修改"οnclick="watch_mod(this.form);" />
< input type="button" value="删除"οnclick="watch_del(this.form);" />
< input type="button" value="保存"οnclick="watch_set(this.form);" />
< /form>

用一个字符串创建一个数组方法:

<script language="javascript">

1. < /body>
   < /html>
2. < script>
3. function spli(){
4. datastr="2,2,3,5,6,6";
5. var str= new Array();
6. str=datastr.split(",");
7. for (i=0;i<str.length ;i++ )
8. { document.write(str[i]+"<br/>"); }
9. }
10. spli();
11. </script

    今天调试了一段js，在ie上运行良好，在火狐上调试出现错误，查资料发现

    obj.add(new Option("文本","值")); //这个只能在IE中有效

    obj.options.add(new Option("text","value")); //这个兼容IE与firefox

    因为这段代码，在网上查资料收藏了这篇文章，实时的温故js

    共勉！！