Javascript 和C#之间的互相调用和访问

<script language="javascript" type ="text/javascript" >
var JSVar = "This is JS Code ";
function getcsharpstring() {
//去调用c#的函数，请注意带参数的写法
var mys = '<%=CSharpString("___________This is JS Code ")%>';
//没有参数的可以这样写var mys = "<%=CSharpString()%>";
alert(mys)
}

function getcsharpvar() {
var mys = '<%= CSharpVar%>';//调问c#中的变量　
alert(mys)
}
//此函数用于C#调用
function CSharpCall() {
alert("这里设置一个ookie ");
//设置一个cookie ,在c#读取这个cookie的值来达到访问JS变量　
document.cookie = "JSVarToCSharp= " + JSVar;
}

</script>

public partial class _Default : System.Web.UI.Page
{
public string CSharpVar = "这是CSharp代码";//C#变量
protected void Page_Load(object sender, EventArgs e)
{

}
//被JS调用
public string CSharpString(string _string )
{
return  "这是CSharp代码" + _string 　;
}

protected void Button3_Click(object sender, EventArgs e)
{
string jsString = "<script   language=javascript > CSharpCall() </script>";
/*请注意:如果这个Button3_Click是一个异步方法的话(即ajax 中),那么:
要用这一句去执行:
ScriptManager.RegisterStartupScript(up, this.GetType(), "1","CSharpCall()",true) */
Page.RegisterStartupScript("ggg", jsString);//调用JS方法

}
protected void Button4_Click(object sender, EventArgs e)
{
//通过读取cookie 来得到JS的变量　
HttpCookie cookie = Request.Cookies["JSVarToCSharp"];
if (cookie != null)
{
string jsVar = cookie.Value.ToString();
}
//可以用同样的方法让JS访问c#代码，如下
/*
c#(加)　：
using System.Web
HttpCookie   UserCookie   =   new   HttpCookie("UserName",UserName);
Response.Cookies.Add(UserCookie);
(注销)
Request.Cookies.Clear();
//将Cookies["UserName"]置空
HttpCookie   customerCookie   =   new   HttpCookie("UserName",   string.Empty);
Response.Cookies.Add(customerCookie);
JS：
function getCookie(objName)
{//获取指定名称的cookie的值
var arrStr = document.cookie.split("; ");
for(var i = 0;i < arrStr.length;i ++)
{
var temp = arrStr[i].split("=");
if(temp[0] == objName) return unescape(temp[1]);
}
}

function delCookie(name)
{//为了删除指定名称的cookie，可以将其过期时间设定为一个过去的时间
var date = new Date();
date.setTime(date.getTime() - 10000);
document.cookie = name + "=a; expires=" + date.toGMTString();
}

*/

}
}