方法1，
使用Response.Write，這種方法會把JS代碼寫在頁面的最頂部(<html>的前面)：
System.Web.HttpContext.Current.Response.Write("<script language=javascript>alert('JS代碼');</script>");
方法2，
使用RegisterStartupScript，這種方法會把JS代碼嵌入在頁面的底部、表單的最後 (</form>前面)，適用於要在頁面控制項載入完成後啟動並執行JS代碼 ：
System.Web.UI.Page page = (System.Web.UI.Page)System.Web.HttpContext.Current.Handler;
if (!page.ClientScript.IsStartupScriptRegistered(page.GetType(),"clientScript"))
page.ClientScript.RegisterStartupScript(page.GetType(), "clientScript", "<script language=javascript>alert('JS代碼');</script>");
方法3，
使用RegisterClientScriptBlock，這種方法會把JS代碼嵌入在頁面的頂部、表單的最前 (<form>後面)，適用於要在控制項載入前執行的JS代碼，類似於上面的Response.Write方式 ：
System.Web.UI.Page page = (System.Web.UI.Page)System.Web.HttpContext.Current.Handler;
if (!page.ClientScript.IsClientScriptBlockRegistered(page.GetType(),"clientScript"))
page.ClientScript.RegisterClientScriptBlock(page.GetType(), "clientScript", "<script language=javascript>alert('JS代碼');</script>");
列子：
///<summary>
///控制項點擊訊息確認提示框
///</summary>
///<param name="page">當前頁面環境,一般為this</param>
///<param name="msg">要顯示的資訊</param>
///<param name="trueDoSomething">如果點確定後要做的事(JavaScript指令碼)</param>
///<param name="falseDoSomething">如果點取消後要做的事(JavaScript指令碼)</param>
public static void ShowConfirm(System.Web.UI.Page page, string msg, string trueDoSomething, string falseDoSomething)
{
StringBuilder Builder = new StringBuilder();
Builder.Append("<SCRIPT language='JavaScript' defer>");
Builder.Append("if(confirm ('" + msg + "')){");
Builder.Append("" + trueDoSomething + "}");
Builder.Append("else{");
Builder.Append("" + falseDoSomething + "}");
Builder.Append("</SCRIPT>");
page.ClientScript.RegisterStartupScript(page.GetType(), "message", Builder.ToString());
}
1.動態建立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尋找對象，
var obj=document.getElementById('mySelect');
添加一個選項
obj.add(new Option(文本,值));
}
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，這裡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);
}
轉自http://www.cnblogs.com/rayking/archive/2008/09/03/1282473.html
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