1、IsStartupScriptRegistered：對象是否註冊了啟用指令碼。
2、IsClientScriptBlockRegistered：對象是否註冊了用戶端指令碼塊。
3、IsClientScriptIncludeRegistered：對象是否註冊了用戶端指令碼包含。
第一個例子：
string info = "<script>alert('你好嗎？');</script>";
//判斷事件是否被註冊，寫入地區：<body>----<script></body>
if (!Page.ClientScript.IsStartupScriptRegistered("test"))
{
//動態註冊並執行Javascript
Page.ClientScript.RegisterStartupScript(this.GetType(), "test", info);
}
第二個例子：
aspx檔案：
姓名：<input id="txtUserName" type="text" />
<input id="btnSubmit" type="button" value="確定" onclick="salert(txtUserName.value)" />
cs檔案：
string info = "function salert(userName){alert('你的名字：' + userName)}";
//判斷test是否登入
if (!Page.ClientScript.IsClientScriptBlockRegistered(this.GetType(), "test"))
{
//動態註冊Javascript
Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "test", info, true);
}
第三個例子：
aspx檔案：
姓名：<input id="txtUserName" type="text" />
<input id="btnSubmit" type="button" value="確定" onclick="salert(txtUserName.value)" />
Jscript.js
function salert(userName)
{
alert("你的名字" + userName);
}
cs檔案：
//判斷test是否登入
if (!Page.ClientScript.IsClientScriptIncludeRegistered(this.GetType(), "test"))
{
//動態註冊Javascript
Page.ClientScript.RegisterClientScriptInclude("test", "Jscript.js");
}
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